The Gore-Tex® membrane is totally waterproof and breathable. Completely wind resistant, keeps you warm and wicks away moisture, ultra-lightweight feel, guaranteeing you optimum thermal comfort.
"WINDSTOPPER® GORE-TEX INFINIUM™ membrane has billions of pores that are 900 times larger than water vapor molecules. While the wind can not penetrate the fabric, the moisture caused by perspiration can easily escape."