Critical to your body's temperature regulation, the SmartWool Neck Gaiter provides superior temperature and moisture managing properties as well as a soft, comfy feel. Made from soft, interlock-knit merino wool for breathable comfort and warmth. Double-layer construction for maximum warmth and versatility. Clean finished seams for no-nonsense comfort. SmartWool does not itch or shrink. Keeps you warm if it gets wet. Naturally odor-free. One size fits all. Machine wash cold; air dry flat.