All About Climbing Karabiner: Specifications, Performance, and Common Uses

Types of Climbing Carabiners

Climbing carabiners are essential safety tools in climbing, mountaineering, rescue, and industrial rope work. They are categorized primarily by their locking mechanism and gate design, each offering unique advantages depending on the application. Choosing the right carabiner is critical for safety, efficiency, and performance in the field.

Screw-Lock Carabiner

Features a threaded sleeve that must be manually screwed into place to secure the gate. Requires deliberate action to lock and unlock, minimizing accidental opening.

Advantages

• Highly reliable locking mechanism
• Simple, durable design with fewer moving parts
• Widely compatible with harnesses, anchors, and ropes
• Commonly used in rescue and technical climbing

Limitations

• Manual locking requires user diligence
• Slower to operate than auto-locking types
• Risk of forgetting to lock if rushed

Best for: Belaying, anchor building, multi-pitch climbing, and rescue operations

Autolock Carabiner

Automatically locks when the gate closes using mechanisms like twist-to-lock, double-action, or triple-action systems. No manual twisting required, enhancing operational speed and safety.

Advantages

• Auto-locking prevents accidental gate opening
• Faster and safer in high-stress or emergency situations
• Ideal for industrial and professional environments
• Reduces human error during critical tasks

Limitations

• More complex mechanism may require maintenance
• Slightly higher cost than screw-lock types
• Potential for misoperation if not properly engaged

Best for: Industrial rope access, via ferrata, guided climbing, and situations requiring rapid, secure connections

Non-Locking Carabiner

Also known as snap-links or spring-loaded carabiners, these have no locking mechanism. The gate opens with pressure and closes automatically via a spring.

Advantages

• Fast and easy to use for quick connections
• Lightweight and compact design
• Ideal for temporary or non-critical attachments
• Commonly used in gear clipping and pulley systems

Limitations

• No protection against accidental gate opening
• Not suitable for primary safety connections
• Can snag or open under load if not oriented properly

Best for: Gear clipping, organizing equipment, racking quickdraws, and non-load-bearing applications

Wiregate Carabiner

Features a gate made from a strong wire instead of solid metal, reducing weight while maintaining strength. The wire design resists freezing and ice buildup, and produces less noise.

Advantages

• Significantly lighter than solid-gate carabiners
• Less prone to icing in cold environments
• Reduced gate flutter during dynamic movements
• Nearly silent operation—ideal for alpine and technical climbs

Limitations

• Wire gate may fatigue over time with heavy use
• Less durable in abrasive or high-wear conditions
• Requires careful inspection for wire damage

Best for: Sport climbing, alpine routes, ice climbing, and any scenario where weight and reliability are critical

Locking Carabiner (General)

A broad category including all carabiners with a locking mechanism—screw-lock, twist-lock, or auto-lock. Designed to prevent accidental gate opening under load.

Advantages

• Maximum safety for life-critical connections
• Essential for belaying, rappelling, and anchor systems
• Available in multiple configurations (HMS, D-shaped, pear-shaped)
• Required by safety standards in professional settings

Limitations

• Heavier than non-locking variants
• More expensive due to complex mechanisms
• Requires proper training for correct use

Best for: Belaying, rappelling, connecting to harnesses, and any application where failure could result in serious injury

Expert Tip: Always visually and physically inspect your carabiner before use. Ensure the gate closes fully and the locking mechanism engages properly. For wiregate carabiners, check the wire for kinks or cracks, especially after exposure to extreme cold or impact.

Industry Applications of Climbing Karabiners

Renowned for their exceptional strength, durability, resistance to wear, and advanced locking mechanisms, climbing karabiners have evolved beyond recreational use into critical safety components across a wide range of professional industries. Their ability to provide secure, reliable connections under high stress makes them indispensable in environments where failure is not an option. Below is a comprehensive overview of how various sectors leverage the performance and safety features of climbing karabiners.

Outdoor Recreation

Karabiners are fundamental tools in outdoor adventure sports, serving as versatile connectors that enhance both safety and convenience. In rock climbing, mountaineering, and via ferrata, they link ropes to harnesses, anchor points, and protection devices such as cams and nuts, forming the backbone of fall protection systems. Their gate mechanisms—whether screw-lock, auto-locking, or twist-lock—ensure secure engagement even in dynamic conditions.

Beyond climbing, hikers, backpackers, kayakers, and mountain bikers use lightweight, non-load-bearing karabiners for gear organization—attaching water bottles, trekking poles, lights, or cooking equipment to packs or belts. Their corrosion-resistant finishes (such as anodized aluminum) make them ideal for prolonged exposure to moisture and rugged terrain. Quick-release functionality allows for efficient access without compromising safety during emergencies.

Construction and Heavy Industry

In industrial settings, karabiners—particularly heavy-duty, certified auto-locking models—are integrated into rigging systems, load control, and personnel safety protocols. They are used to connect slings, chains, and lifting gear to cranes, hoists, or trolleys, ensuring secure attachment points during material handling and equipment movement. Their high tensile strength (often rated above 20 kN) and resistance to abrasion and impact make them suitable for demanding environments like construction sites, mining operations, and offshore platforms.

Maritime and offshore industries rely on marine-grade stainless steel karabiners that resist saltwater corrosion while maintaining structural integrity under constant load. These are commonly used in davit systems, gangway rigging, and cargo securing. Compliance with international safety standards (e.g., CE, UIAA, OSHA) ensures that industrial karabiners meet strict requirements for load capacity, gate strength, and fatigue resistance.

Military and Security Operations

Military and law enforcement units utilize climbing karabiners in tactical and operational scenarios where rapid deployment and equipment reliability are paramount. Special forces employ lockable karabiners in fast-roping and rappelling operations, enabling swift insertion or extraction from helicopters or elevated positions. Their ability to withstand extreme forces and repeated use without failure makes them trusted components in high-risk missions.

Additionally, karabiners are used to organize and secure mission-critical gear such as radios, holsters, breaching tools, and night-vision equipment. Tactical webbing and MOLLE systems often incorporate low-profile, silent (rubber-sleeved) karabiners to prevent snagging and noise. Their compact design and ease of use with gloves further enhance their utility in combat and emergency response environments.

Search and Rescue (SAR)

Search and rescue teams operate in unpredictable and hazardous conditions, where the reliability of every piece of equipment can mean the difference between life and death. Karabiners play a central role in vertical rescue systems, allowing rescuers to build mechanical advantage pulley systems, secure anchor points, and connect victims to lowering or hauling lines.

D-shaped and oval karabiners are preferred for their optimal strength-to-weight ratio and compatibility with multiple rope configurations. Rescue-grade karabiners are typically triple-action auto-locking types, requiring multiple deliberate motions to open—minimizing the risk of accidental disengagement. Their performance in wet, icy, or dusty conditions is rigorously tested, ensuring functionality in alpine, urban, and wilderness rescue operations.

Working at Height – Industrial Safety Applications

In any industry involving work at elevation—such as window cleaning, telecommunications tower maintenance, wind turbine servicing, or scaffolding operations—karabiners are essential components of personal fall protection systems (PFPS). They connect lanyards, retractable fall arresters, and positioning straps to full-body harnesses, providing a secure link between the worker and anchorage point.

OSHA and ANSI-compliant karabiners used in these contexts must meet stringent criteria, including a minimum gate strength of 16 kN and a major axis strength of 22 kN. Features such as keylock noses prevent snagging on ropes or structures, while color-coded gates help identify load status or inspection dates. Regular inspection, load testing, and retirement after significant impact or wear are mandatory to maintain safety integrity.

Important: Always ensure that karabiners used in professional or safety-critical applications are certified for the intended load and environment. Never use recreational-grade karabiners for industrial or rescue purposes. Regular inspection for cracks, gate damage, deformation, or wear is essential. Retire any karabiner that has sustained a major fall or shows signs of compromise. Proper storage away from chemicals, moisture, and UV exposure extends service life and maintains performance.

Product Specifications and Features of Climbing Karabiners

Climbing karabiners are essential safety components in mountaineering, industrial rigging, rescue operations, and recreational climbing. Designed to connect ropes, harnesses, anchors, and gear, their performance directly impacts user safety under extreme conditions. This guide provides a comprehensive overview of technical specifications, proper installation, usage guidelines, and maintenance protocols to ensure optimal performance and longevity.

Material Composition

Karabiners are engineered using high-strength alloys selected for their exceptional strength-to-weight ratios and environmental resilience.

• Titanium: Offers superior corrosion resistance and is non-magnetic, making it ideal for alpine and marine environments. Though more expensive, it provides excellent durability without added weight.
• Aluminum Alloys: Widely used due to their lightweight nature (30–100g range). Different temper grades (e.g., 7075-T6) enhance tensile strength while maintaining low mass—perfect for sport climbing and alpine pursuits.
• Steel Alloys: Used in industrial and rescue karabiners where maximum strength and wear resistance are critical. Heavier than aluminum but capable of withstanding repeated heavy loads and abrasive conditions.

Key Insight: Material choice should align with application—lightweight for mobility, steel for durability.

Weight & Load Capacity

Performance is balanced between portability and structural integrity based on intended use.

• Weight Range: From 30g (ultralight sport models) to 300g (heavy-duty industrial variants). Lightweight options reduce fatigue during long climbs.
• Dynamic Strength: Minor climbing karabiners typically support 20–25 kN along the major axis. Major climbing and belay karabiners are rated at 30–40 kN for dynamic fall arrest.
• Static Strength: Rescue and industrial karabiners exceed 30 kN on all axes, with some rated up to 50 kN for redundancy in life-critical systems.
• Gate Open Strength: Reduced by 30–50% when gate is open—always keep gates closed during load-bearing scenarios.

Safety Note: Never exceed the marked kN rating, and account for multi-directional forces in complex rigging.

Gate Design and Functionality

The gate mechanism determines ease of use, security, and reliability under stress.

• Wiregate Karabiners: Feature a spring-loaded wire gate that resists icing and dirt buildup. Preferred by climbers for fast rope clipping and reduced gate flutter during falls.
• Solid Gate: Durable and resistant to deformation, commonly used in industrial settings where impact resistance is crucial.
• Locking Mechanisms: Include screw-lock, twist-lock, and auto-locking (triple-action) systems. Auto-lockers are ideal for rescue operations due to their self-engaging safety features.
• Gate Opening: Typically 20–25 mm, allowing one-handed operation even with gloves. Larger gates accommodate thick ropes or multiple carabiners.

Pro Tip: Use wiregate karabiners for climbing efficiency; opt for auto-locking types in high-risk environments.

Shape and Application

Karabiner shape influences load distribution and functional versatility.

• D-Shaped: Asymmetric design transfers load efficiently to the spine, offering high strength-to-weight ratio—ideal for anchoring and hauling.
• Oval: Symmetrical shape allows equal loading from multiple directions; best for connecting multiple devices or equalizing anchors.
• Offset D: Combines high strength with a larger gate opening for easier clipping—popular among sport climbers.
• Pear (HMS): Wide nose and large basket accommodate Munter hitches and double ropes, essential for belaying and rappelling.

Usage Guidance: Match shape to function—HMS for belaying, D-shape for directional loads.

How to Install Climbing Karabiners Safely

Correct installation prevents cross-loading, gate failure, and system collapse. Always follow manufacturer guidelines and industry best practices.

• Basic Attachment: Clip the karabiner into the harness loop or anchor point with the gate facing away from the direction of movement. Ensure the load runs along the spine (strongest axis), not across the gate.
• Avoid Cross-Loading: Never allow the karabiner to be loaded sideways between the spine and gate. This can reduce strength by up to 50%. Use double karabiners in opposing directions if lateral forces are expected.
• Rigging Systems: In haul or lowering setups, use only locking karabiners at critical junctions (e.g., pulley attachments). Position them so the gate faces outward and cannot be accidentally opened by friction or movement.
• Rescue Operations: Secure victims using dual-locking karabiners connected to full-body harnesses. Double-check all gates are closed and locked. Implement backup safety lines where possible.

Safety Reminder: Always perform a final check before committing weight—verify orientation, gate closure, and locking mechanism engagement. A single mistake can lead to catastrophic failure.

Best Practices for Using Climbing Karabiners

Effective use depends on matching the right karabiner type to the task while maintaining situational awareness.

• Connecting Ropes and Harnesses: Use auto-locking karabiners for belay loops and tie-ins. Confirm the gate locks automatically after closing.
• Gear Organization: Non-locking karabiners are sufficient for attaching quickdraws, cams, or tools to your harness. Their speed and ease of use enhance efficiency during climbs.
• Rigging and Hauling: Employ large HMS pear-shaped karabiners for friction hitches and redirect points. Use multiple locking karabiners in tandem for redundancy.
• Environmental Conditions: In icy or dusty environments, choose wiregate models to prevent jamming. Avoid using karabiners near chemicals or saltwater without thorough cleaning afterward.

Maintenance and Inspection Protocol

Regular maintenance extends service life and ensures continued safety. Even minor damage can compromise structural integrity.

• Cleaning: Wash karabiners regularly with mild soap and water. Use a soft-bristled brush to clean crevices and the gate mechanism. For wiregates, gently clean around the spring to prevent grit buildup.
• Lubrication: Apply a small amount of silicone-based lubricant only to the moving parts (pivot point and locking sleeve) if operation becomes stiff. Avoid oil-based lubes, which attract dirt and degrade over time.
• Inspection Checklist:
  • Check for cracks, deep scratches, or deformation in the body or gate.
  • Ensure the gate opens and closes smoothly without binding.
  • Verify the locking mechanism engages fully and cannot be opened unintentionally.
  • Look for elongation or wear in the nose area where ropes repeatedly contact.
• Repair and Retirement: Karabiners are not user-repairable. Any sign of significant wear, corrosion, or impact damage requires immediate retirement. Do not attempt welding, filing, or DIY fixes—these void certifications and create weak points.

Additional Safety & Performance Tips

• Color Coding: Use colored karabiners to distinguish roles (e.g., red for primary anchor, blue for belay) and prevent misuse.
• Storage: Keep karabiners in dry, padded pouches to prevent nicks and corrosion. Avoid tossing them loosely into gear bags.
• Compatibility: Ensure karabiners are compatible with rope diameter and hardware (e.g., cam lobes, pulleys) to avoid binding or slippage.
• Certifications: Look for UIAA, CE, or EN 12275 certification marks—these guarantee rigorous testing for climbing applications.
• Lifespan: Replace karabiners every 5 years with regular use, or immediately after a major fall or impact.

Professional Recommendation: Invest in high-quality, certified karabiners from reputable brands. While premium models may cost more upfront, they offer superior reliability, longer service life, and peace of mind in critical situations. Always prioritize safety over convenience—proper selection, installation, and maintenance are non-negotiable in any climbing or rigging environment.

Quality and Safety Considerations of Climbing Karabiners

Karabiners are critical components in climbing, rescue, and industrial safety systems. Their reliability directly impacts user safety in high-risk environments. Understanding the key quality and safety factors—material composition, strength ratings, certifications, load management, and wear inspection—is essential for ensuring equipment performs as expected under stress. This guide provides a comprehensive overview of best practices and critical considerations when selecting, using, and maintaining climbing karabiners.

Safety Warning: Never use a damaged, worn, or uncertified karabiner in load-bearing applications. Equipment failure can result in serious injury or death. Always inspect gear before each use and retire any component showing signs of structural compromise.

Quality Considerations for Optimal Performance

The quality of a karabiner determines its durability, strength, and resistance to environmental degradation. High-quality materials and engineering ensure reliable performance in demanding conditions. Key quality factors include:

• Material Composition:
  • Aluminum: Lightweight and corrosion-resistant, aluminum is widely used in recreational climbing due to its favorable strength-to-weight ratio. However, it is more prone to surface wear and galling over time.
  • Titanium: Offers superior strength, lighter weight, and exceptional resistance to corrosion and fatigue compared to aluminum. Titanium alloys are ideal for industrial, rescue, and marine environments where longevity and performance under extreme conditions are paramount.
  • Steel: Used in heavy-duty industrial applications, steel karabiners provide the highest tensile strength but are significantly heavier. Best suited for static rigging and permanent installations.
• Strength Ratings (kN – Kilonewtons):
  • Locking karabiners should have a minimum tensile strength of 25 kN along the major axis.
  • Non-locking (snap) karabiners should meet or exceed 20 kN on the major axis.
  • Side (minor axis) strength should be at least 7–10 kN, though loading in this direction must be avoided.
  • Gate-open strength is typically reduced to around 8 kN—never load a karabiner with an open gate.
  • Always verify kN ratings stamped directly on the karabiner and match them to your intended use (e.g., climbing, rescue, rigging).
• Certifications and Standards:
  • UIAA 121 & CE EN 12275: The gold standard for climbing and mountaineering equipment. These certifications verify performance under dynamic loads, gate integrity, and cycle testing.
  • EN 362: Applies to personal protective equipment (PPE) for work at height, ensuring suitability for industrial and rescue applications.
  • NFPA 1983: Required for technical rescue operations in the U.S., with separate ratings for General Use (GU) and Technical Use (TU) karabiners.
  • Always purchase certified gear from reputable manufacturers and avoid counterfeit or unmarked products.

Cross-Loading: A Critical Safety Hazard

Cross-loading occurs when force is applied across the minor axis of the karabiner—perpendicular to the spine—typically when the load shifts to the gate and opposite side. This orientation can reduce strength by up to 50% or more, drastically increasing the risk of failure.

• Cross-loading is one of the most common causes of preventable karabiner failure.
• Always orient the karabiner so that the load runs along the strong axis (spine to nose).
• Use locking karabiners in critical connections to prevent accidental gate opening and misalignment.
• Modern designs incorporate anti-cross-loading features, such as internal bumpers or gate stops, to prevent the rope or sling from shifting into a weak orientation.
• In rescue and industrial settings, double-check all connections during setup and under load simulation.

Expert Tip: Use pear-shaped (HMS) karabiners for belay and rappel setups—they naturally guide ropes into the correct loading position and reduce the risk of cross-loading during complex rigging operations.

Wear and Tear: Identifying When to Retire Equipment

Even high-quality karabiners degrade over time due to mechanical stress, environmental exposure, and improper use. Regular inspection is crucial for maintaining safety.

• Visual Inspection: Look for deep grooves, scratches, pitting, or deformation—especially near the gate, nose, and bearing surfaces.
• Functional Check: Ensure the gate opens and closes smoothly without sticking or excessive play. A loose or damaged gate mechanism compromises safety.
• Locking Mechanism: Inspect threaded sleeves, twist locks, or auto-locking mechanisms for wear, corrosion, or stripped threads.
• Localized Wear: Concentrated wear near the locking end can impair function and reduce structural integrity.
• Environmental Damage: Saltwater, chemicals, and extreme temperatures accelerate corrosion, particularly in aluminum models.
• Impact Damage: Dropping a karabiner on hard surfaces can create micro-fractures not visible to the naked eye.

When to Retire a Karabiner: Discard immediately if you observe any of the following:

• Visible cracks or deformations
• Gate does not close securely
• Locking mechanism fails to engage
• Excessive wear in high-stress zones
• Unknown history or second-hand gear with no certification

Maintaining Proper Load and Usage Practices

Even the highest-quality karabiner can fail if misused or overloaded. Adhering to load limits and proper techniques is non-negotiable.

• Respect Load Limits: Never exceed the rated kN capacity. Dynamic loads (falls) generate forces far beyond static weight—always include a safety margin.
• Use Locking Karabiners for Critical Connections: Essential for belay devices, anchor points, and rescue systems where accidental disengagement could be catastrophic.
• Double-Locking Karabiners: Provide redundant security in high-consequence scenarios. Ideal for through-life safety systems.
• Auto-Locking (Self-Locking) Karabiners: Automatically engage upon closure, minimizing human error. Preferred in fast-paced or high-stress environments like firefighting or rope access.
• Industrial Applications: Require high-strength, certified karabiners with traceable manufacturing records. Ensure compliance with OSHA, ANSI, or local safety regulations.
• Proper Rigging: Avoid sharp edges, abrasion, and twisting forces. Use protective sleeves or padding when necessary.

Maintenance Tip: Clean karabiners regularly with mild soap and water. Lubricate moving parts (sparingly) with a dry-film lubricant. Store in a dry, cool place away from UV exposure and chemicals to extend service life.

Final Safety Recommendations

• Inspect every karabiner before and after each use.
• Retire gear at the first sign of damage or uncertainty.
• Train all users on proper loading, locking, and inspection procedures.
• Keep a log of equipment usage and exposure history when possible.
• Replace karabiners every 5 years with regular use, or sooner if exposed to harsh conditions.
• Only use karabiners designed for life-support applications—never repurpose hardware store clips or non-certified connectors.

Remember: Your life depends on the integrity of your gear. Investing in high-quality, certified karabiners and following strict safety protocols is not optional—it's a fundamental responsibility for anyone working at height or in technical environments. When in doubt, consult a qualified safety professional or equipment manufacturer.

Frequently Asked Questions About Carabiners

The material used in a carabiner significantly influences its strength, weight, durability, and suitability for different environments. Here’s a breakdown of the most common materials and their real-world performance:

• Aluminum: Offers an excellent strength-to-weight ratio, making it ideal for climbing, hiking, and general outdoor use. Aluminum carabiners are lightweight and corrosion-resistant, though they may wear faster under heavy abrasion or in industrial settings.
• Titanium: Combines high tensile strength with exceptional corrosion resistance and a lighter weight than steel. While more expensive, titanium is favored in extreme environments such as alpine climbing or marine rescue operations where reliability is paramount.
• Steel: Provides maximum strength and wear resistance, making it the preferred choice for industrial applications, rigging, and technical rescue. Though heavier than aluminum or titanium, steel carabiners withstand harsh conditions, including high heat, impact, and prolonged exposure to abrasive elements.

Selecting the right material depends on your specific activity—lightweight aluminum for mobility, titanium for high-performance scenarios, and steel for maximum durability.

Non-locking carabiners can be safe in climbing—but only when used appropriately. Their safety hinges on proper application and context:

• Appropriate Uses: Ideal for connecting quickdraws to bolts, gear loops, or other non-critical points where the gate is unlikely to open accidentally due to controlled loading.
• Risks: The gate can potentially open under dynamic movement, cross-loading, or contact with rock surfaces, which could lead to equipment disengagement.
• Climber Best Practices: Most climbers use non-locking carabiners for passive roles (like gear clipping) but rely on locking carabiners for critical connections such as the belay device, anchor points, or harness attachment.

In summary, non-locking carabiners are safe when used correctly in low-risk configurations, but should never replace locking models in life-support systems.

Yes, locking carabiners can technically be used for organizing gear, but they are generally not the best choice for this purpose. Here's why:

• Slower Operation: The locking mechanism requires extra steps to open and close, which reduces efficiency when frequently accessing gear.
• Unnecessary Security: Gear organization rarely involves life-critical loads, so the added security of a lock is redundant.
• Increased Weight and Bulk: Locking carabiners are typically heavier and bulkier than non-locking versions, adding unnecessary load during long hikes or climbs.

For optimal efficiency, climbers and outdoor enthusiasts usually choose non-locking carabiners—especially wiregate or bent-gate models—for organizing gear, as they allow rapid attachment and removal while keeping weight low.

Regular inspection is crucial to maintaining carabiner safety and performance. Follow this inspection schedule based on usage:

• Before Every Use: Conduct a visual and tactile check for cracks, deep scratches, gate misalignment, or deformation. Spin the gate to ensure smooth operation and verify that the locking mechanism (if present) functions correctly.
• Monthly or After Heavy Use: Perform a more thorough inspection, especially if exposed to falls, abrasive surfaces, saltwater, or extreme temperatures.
• Every Three Months (Minimum): Even with infrequent use, inspect stored carabiners every quarter to detect hidden corrosion or material fatigue.

When to Retire a Carabiner: Discard immediately if you notice any of the following:

• Visible cracks or fractures
• Gate does not close or lock properly
• Excessive wear on the nose or spine (elongation)
• Corrosion, especially in aluminum or titanium models

Proper care and frequent inspection extend service life and ensure reliable performance when it matters most.

Wiregate carabiners have become increasingly popular in climbing and mountaineering due to several performance advantages over traditional solid-gate designs:

• Lightweight: The wire gate design removes excess material, reducing overall weight—critical for climbers carrying multiple carabiners on long routes.
• Reduced Gate Flutter: Wire gates are less prone to bouncing open in windy or dynamic conditions, improving security during falls or rapid movements.
• No Ice or Debris Buildup: Unlike solid gates, wire gates resist freezing shut in cold, wet environments, making them ideal for ice climbing and alpine expeditions.
• Durability: Despite their slim profile, wire gates are made from high-tensile steel and offer comparable strength to solid gates, with less risk of gate damage from impacts.
• Smooth Operation: They open easily with one hand and maintain consistent spring tension over time.

While wiregate carabiners may feel less substantial to some users, their reliability, performance in extreme conditions, and weight savings make them a top choice for serious climbers and outdoor professionals.