First Layer TechnologyAs the first layer of clothing next to your skin, the base layer is crucial for how the outer layers are able to perform and how comfortable you feel. Consequently we only use the latest in fabric technologies for the best perspiration and temperature management. Our base layers will keep you comfortable and warm when its cold outside, and will keep you cool when temperatures are high.Material: 57% polyester , 34% polyester, 9% elastaneWarming and quick-drying fabricSilicone tape on upper hemWindprotection pad on kneesPre-shaped