EMS Power Stretch Skull Cap
Here's what other sites are saying:
A body-hugging four-way-stretch skull cap made of Polartec Power Stretch. Ideal for cross-country skiing and other highly aerobic winter activities.. . . . Polartec Power Stretch: 88% polyester, 12% spandex. Equivalent in warmth to lightweight fleece. Body-hugging four-way stretch. Keeps your skin dry when you sweat. Highly breathable. Wind and abrasion resistant. Comfortable next to skin. Machine washable.