Mountain clothing and equipment are expected to perform in environments where failure is not an option. Cold, abrasion, sustained rain and long exposure to physical stress all demand reliable performance. Rab approaches testing with a clear focus on mountain use, combining laboratory measurement with real world validation.
Rab publicly documents its testing philosophy and methods through its Rab Lab testing platform, where it explains how materials are evaluated before being approved for mountain use. This article explains how Rab tests its gear, based entirely on information published by Rab itself.
Testing at the Rab Lab
Rab conducts technical testing at its dedicated Rab Lab, where fabrics and materials are evaluated against defined performance requirements. The lab is used to measure durability, waterproofness and breathability using established testing methods.
Rab presents these tests as tools for understanding how materials behave under stress and how they are likely to perform in real mountain conditions.
Durability testing with the Martindale method
Rab uses Martindale abrasion testing to assess long-term fabric durability under repeated mechanical stress. Fabric samples are subjected to continuous rubbing using a standardized machine. This process simulates repeated wear, such as the abrasion caused by carrying a backpack.
Rab explains that this test is designed to replicate the friction of a 6kg pack rubbing against a waterproof jacket over extended use. Results help determine how well fabrics resist surface breakdown over time.
Durability testing allows Rab to compare materials and identify those that maintain integrity under repeated mechanical stress.
Measuring waterproofness with hydrostatic head testing
Rab measures waterproof performance using hydrostatic head testing, which evaluates how much water pressure a fabric can withstand before moisture penetration occurs. This method evaluates how much water pressure a fabric can withstand before moisture penetrates the material.
During the test, a column of water is applied to the fabric. The height of the water column, measured in millimeters, at which leakage occurs determines the waterproof rating. Rab states that its waterproof gear must meet a minimum rating of 10,000mm.
This threshold provides a clear baseline for waterproof performance across Rab’s technical products.
Breathability testing using RET and MVTR
Rab evaluates breathability using RET and MVTR breathability testing, two laboratory measurements that help quantify moisture and heat transfer during exertion. The first is RET, measured with a Sweating Guarded Hot Plate. This test places fabric over a heated, porous plate that simulates sweating skin and measures resistance to evaporation.
The second measurement is MVTR, which calculates how much moisture vapor passes through a square meter of fabric over a 24 hour period. Together, these tests help Rab assess how effectively a fabric releases heat and sweat during activity.
Rab presents these methods as ways to quantify comfort during exertion, particularly in wet and cold environments.
Understanding waterproof membrane construction
Rab also explains waterproof membrane construction, detailing how membrane thickness and structure block liquid water while allowing vapour to escape. According to Rab, these membranes range from approximately 7 to 30 microns in thickness and function by blocking liquid water while allowing water vapor to escape.
This technical explanation helps contextualize lab test results by linking measured performance to material construction.
Field testing alongside laboratory benchmarks
Rab states that laboratory testing is always supplemented with field testing alongside laboratory benchmarks, ensuring lab results align with real mountain use. Prototypes are sent to a global team of athletes who evaluate products in demanding environments.
Rab specifically references testing in locations such as the Scottish Highlands and the Himalayas. Feedback from these environments is used to assess fit, construction and functional performance under real mountain conditions.
This combination of lab data and field feedback ensures that measured performance aligns with practical use.
Linking test results to product decisions
Rab uses the results of laboratory and field testing to inform material selection and product design. Testing helps establish minimum performance requirements and ensures consistency across different product categories.
Rather than presenting tests as isolated experiments, Rab frames them as part of an ongoing process that supports product refinement and validation.
Conclusion
Rab approaches gear testing through a structured system that combines laboratory measurement and field validation. Durability is assessed using the Martindale abrasion test, waterproofness through hydrostatic head measurement, and breathability through RET and MVTR methods. These benchmarks are then cross referenced with real world testing in demanding mountain environments.
By openly explaining its testing methods through the Rab Lab platform, Rab provides a clear and detailed view of how its gear is evaluated. This transparency allows users to understand how performance claims are verified and helps bridge the gap between laboratory data and real world expectations.
Transparency rating: Very good
Rab publicly documents specific laboratory testing methods, including equipment and procedures, and explains how lab results are supplemented with field testing in demanding environments. Compared to most outdoor brands, Rab’s transparency around gear testing is very good.
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