100% Microsupreme,Microsupreme is a hollow core micro denier fiber that keeps feet dry and comfortable * Ultra flat seam toe pocket closures are constructed to give the user a basically seamless toe that improves fit and elimiates pressure points with anatomical padding specifically designed to fit a skiers needs * Ventilation channels are located on both sides of the sock and connect with the ribs to transport moisture out fo the sock away from the foot. * Ribbed cuffs are the finished tops that insures the sock stays up and fits comfortably without pressure points * machine wash and dry