The Aggressor Sock 2.0 is a versatile, midweight men&';s riding sock in KLIM&';s lineup, designed to wick moisture and keep your feet comfortable in various 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 want a little extra warmth without significant bulk. Teton Merino Wool blended w/ acrylic, Polyamide Nylon, Lycra for durability & comfort (36% Merino Wool, 31% Acrylic, 11% Nylon, 22% Elastane) Made of European sourced yarns Reinforced toe, heel, sole Engineered Terry Loop for strategic cushioning and warmth Arch & ankle support stretch bands 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