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Putting our Yak/Tencel Fabric to the test

While scientific lab testing doesn’t exactly replicate real world situations, it is the most reliable and easiest way to prove the benefits of yak wool against merino wool. We completed testing of our 65% Yak wool - 35% Tencel fabric with Intertek Testing Services (ITS) in Hong Kong (the largest consumer goods testing service in the world). ITS uses testing procedures that conform to ISO or ASTM standards. Below are the results of the tests, with comparisons to other similar merino wool garments available on the market.

Thermal Resistance

Thermal resistance is another way to say how warm the material is. The higher the number, the warmer the material as less heat can pass through the fabric. Our 65% Yak 35% Tencel is almost as warm as Icebreakers 260gsm 100% merino fabric, but ours is over 25% lighter at 190gsm. The warmth of yak fiber allows us to use Tencel to make our products stronger, more durable, softer and better at managing moisture without sacrificing on warmth. Compared to a similar weight Icebreaker 100% merino, our fabric is slightly warmer.

Peak to Plateau Yak-Tencel Fabric vs Icebreaker merino

Test Conditions

Thermal Resistance

Test Standard ISO 11092-2014
Mean Thermal Resistance 0.038 ºCm2/W
Measuring Unit Temperature 35 ºC ± 0.1 ºC
Air Temperature 20 ºC ± 0.1 ºC
Relative Humidity 65% ± 3%
Air Velocity 1 m/s ± 0.05 m/s
Testing Method Inside of fabric towards the measuring unit
Number of Tests 3