Borvelo Bike Cycling Fleece Thermal Cap,Thermal Fleeced Skull Cap,Helmet Liner for Winter Bike Cycling 90% Polyester, 10% spandex fleece. Windproof Soft Shell forehead protection with elastic binding on edges,Will not lose shape, form or stretch out. Dedicated to keeping your head warm, dry, and comfortable during cool weather rides. Essential: a warming, extremely elastic cap that can be worn under the helmet. Doesn`t irritate or restrict the wearer, and is highly compact for easy packing. Suit for cycling, running, camping, hiking,skiing, snowboarding,One size fits most men and women.