The KLIM Aggressor Sock 1.0 is a versatile, lighter-weight men&';s riding sock in KLIM&';s lineup, designed to wick moisture and keep your feet comfortable in various winter temperatures. Made of a Teton Merino Wool blend, these durable socks enhance the performance of KLIM&';s waterproof, breathable footwear to keep you comfortable in various riding conditions. Great for riders who don&';t need thick heavyweight socks. Teton Merino Wool blended w/ acrylic, Polyamide Nylon, Lycra for durability & comfort (30% Merino Wool, 30% Acrylic, 25% Nylon, 15% Elastane) Made of European sourced yarns Reinforced toe, heel, sole Engineered Terry Loop for strategic cushioning and warmth Arch & ankle support stretch bands Arch & shin air channels for moisture control Patterned front mid ankle bend for reduced bulk Tubular cuff for better fit & stretch recovery Over-the-calf height Men&';s sizing: SM = 4-6, MD = 7-9, LG = 10-12, XL = 13-15