100% Polyester Material: 100% Polyester,Head circumference: 51-59cm. Package: 2 x Skull cap. Comfortable: Crafted with fast-drying soft and strechy material our cycling helmet liner cap feature prevent sweat from coming into your eyes.,No matter the sports you’re playing, our moisture wicking skull cap makes sure that it will wick away sweat, keep you warm in winter and cool on warmer weather. Multi-Function:Both indoors and outdoors activities. It will give you comfort while walking, hiking, jogging, running, workout, cross training, running, cycling, gym, tennis, dancing, basketball or whatever you could think of! Sun Protection: This skull cap will also protect your head from 97.5% of UVA and UVB rays. Lab tested UPF 45+. Customer Service:We love our customers and all our products are backed by our ironclad promise to you. Any problem with your product we will refund and replace!