Breathability
Let air in. Leave sweat out
Uses showerproof fabrics that have tiny pores in the fabric, larger than water vapour molecules (so these can get out) but much smaller than drops of rain (so these can’t get in).


SERIOUS FISICS
Capillary pressure
The main force responsible for the movement of moisture along or through a fabric, where the force of the surface tension between the liquid and the walls of a narrow gap or pore overcome the forces between the molecules of the liquid, moving it into empty gaps until the forces even out.