This unique headwear can be worn like a beanie, except it extends quite a bit, and both ends are open. It is adjustable, and quite breathable. It's thin enough so that it can be worn under a helmet. Size: one size, 9 wide, 17 long. Material: 100% cotton. Feature: adjustable, soft, strechable, sleek material, open on both ends. Machine washable. Importeted.