Sweating is a natural process, part of what you could call the natural air conditioning of the human body. When we exercise our muscles produce heat. The body must stay at a homeostatic or steady-state of temperature, therefore it must find a way to cool itself. We balance our core temperature by sweating. Sweating essentially balances our body temperature by evaporative cooling.
To support our "human air conditioning" waterproof fabrics must let the sweat out. If you sweat more than the fabric can handle, two things happen:
- 1) Simultaneously the air inside your jacket heats up, while its relative humidity reaches 100%.
- 2) Evaporative heat loss (your human air conditioning) becomes ineffective, which means your body's ability to balance its temperature is compromised.
As a result you overheat. We call this the boiler effect. Eventually you soak in your own sweat - the sweat that is trying to cool you down. Worse, when you stop exercising all that sweat inside your jacket, boots and gloves makes you feel cold and miserable. The physiological experts call it "post-exercise chill." Sound familiar?
All humans sweat. A lot. Especially athletes. Humans simply walking produce 0.25 to 0.5 liters of sweat per hour, and up to 1.5 liters during strenuous activity. All this sweat has to move through your clothing system, your gloves, and your footwear.
If you're wet, you're miserable. If you're dry, you're comfortable. eVent fabrics allow sweat to quickly evaporate to the outside, keeping you dry on the inside.
Because eVent fabrics lets sweat escape up to twice as fast as common waterproof/breathables. eVent fabrics let the sweat out.™
