The Science of feeling cool.


When we designed ActiCool, we spent a lot time in R&D working with multiple labs to make sure that what we were building was going to work.

We started off with thermal imaging, seeing exactly how the fabrics cool the surface temperature of the skin in various environments and at different levels of strenuous activities.  We also performed testing on our users, taking their temperature and heart rate, and monitoring their required amount of hydration.


Then we got really scientific.

We turned to Q Max testing, a method of testing the instantaneous feeling of warmth or coolness of an object that encounters the skin.

Basically, how our ActiCool fabrics feel against the skin on contact.  The higher the value, the cooler the item feels. 


Machine KEF-F7(THERMO LABO)          
Temperature: 20   
Relative humidity: 65            



Then we moved on to Thermal Effusivity testing.  Thermal effusivity is most typically measured to predict how ‘cool’ or ‘warm’ a textile feels.  It has a square root proportionality to the density, thermal conductivity, and specific heat capacity of the material. Dry fabrics often contain pockets of air between the strands, resulting in thermal effusivity values that are typically low. When dry fabrics are exposed to moisture, the air is replaced by water, which has a much higher thermal effusivity. This will cause the fabric to exhibit a higher thermal effusivity value when wet, making it feel ‘cooler’.


That is the reason why we moved over to thermal effusivity testing, as it is based on the fact that we are always sweating, and that ActiCool begins to absorb the moisture and humidity from your skin on contact.  As we move around and heat up, we sweat more, so we tested our gear at all levels of anticipated physical output.

ActiCool > Athletic Wear


Machine Thermtest TLS-100  
Test time: 2 seconds
Test Method: ASTM D7984-16