The KLIM Crew Sock contains all of the ingredients of a technical, durable riding sock delivered in the style of a crew-height everyday sock. Designed to wick moisture quickly away from the skin for dry and comfortable feet. COOLMAXA(R) Polyester, Polyamide Nylon, Lycra blend (52% Polyester, 24% Nylon, 24% Elastane) Made of European sourced yarns Reinforced toe, heel, sole Terry Loop footbed for cushioning and warmth Arch & ankle support stretch bands Arch air channels for moisture control Patterned front mid ankle bend for reduced bulk Ribbed cuff Crew height Men&';s sizing: SM = 4-6, MD = 7-9, LG = 10-12, XL = 13-15 Women&';s size = men&';s + 2