About this itemExtremely warm: very comfortable warm wool material, completely covering the ears, preventing cold air from entering the ears. Whether you are exercising or wandering, you will like the warmth and elasticity of this wool headband.Stretch to size: The headband is elastic on both sides of all lines to accommodate a wider range of head sizes. It is suitable for most adults, men and women with a head circumference of 22 inches, whether wearing a helmet or cap.Comfortable and not cumbersome: The sweatband is very soft, elastic, but not cumbersome, not deformed, and will remain the same when running.Washable and durable: This earmuff is washable, beautifully made, and durable without excess string or uncut parts.Applicable head circumference: 50-61CMSuitable: This headdress is suitable for running, cycling, jogging, leisure walking and various outdoor activities in cold weather.