The movement of water or water vapor from one side of the fabric to the other, caused by capillary action, wicking, chemical or electrostatic action. Breathability Rating. The higher the number—the more breathable the fabric. Specifically, the breathability rating is expressed in grams of how much vapor a square meter (G/M2) of fabric will allow to [..]

The more you exercise, the hotter you get and the more you sweat. As the sweat evaporates it cools you down. Breathable garments allow the sweat vapour to escape, keeping you comfortable. If the sweat vapour is allowed to build up in your clothing, it becomes damp. Once you stop exercising, the damp clothing draws heat away causing your body to coo [..]

How good a material is at transferring moisture from the body into the atmosphere. Measured in grams per meter squared (g/m2

The amount of air that is let into a garment and water wicked, or taken, away from the inside of the garment.

Breathable fabrics allow water vapour (eg sweat) to pass out through the fabric, but prevent liquid water (eg rain) getting in. This prevents clamminess from a build up of moisture inside the garment. [..]

"Breathability" describes a fabric characteristic that allows air to circulate freely through a garment, which in turn helps regulate body temperature. Fabrics such as cotton and linen are w [..]