Made of 85% polyester and 15% spandex Suit for all shapes and sizes,with appr.53cm/20.8inches perimeter Special design for outdoor sports,like motorcycling, biking, running, working out and skiing,etc Keep you warm in cold days,make your brain totally clear and warm Breathable skull cap with high efficient perspiration to keep your head clear and comfortable Dirt Resistant, the lightweight head cover absorbsthe sweat and keep your helmet clean all the time Provide a stylish for you, compact design and nice shaping make it looks cool and snug fit on your head