The Halo Antifreeze Skull Cap is Halo's answer to cold weather, outdoor exercise. A full coverage skull cap made with top quality Driline fabric with sides that completely cover the ears with wind resistant, double layer Driline. This antimicrobial fabric is embedded with silver ions to inhibit the growth of bacteria and reduce bad odors. Halo's patented SweatBlock Seal forms a water tight seal that channels sweat back and away from the eyes and face. Flat lock stitching provides a smooth comfortable fit. Works great under helmets or worn alone. Hand wash, hang dry. One year warranty against manufacturer defects. Made in USA. One Size fits most.