When the temperatures take a dive, you need the Simms Men's Merino Thermal OTC Socks to really lock in some heat! These socks are heavyweight and designed to trap the most heat! The Merino wool is naturally wicking and odor resistant, so it keeps you comfortable all day long! The over-the-calf design helps protect your legs from your boots. These socks are made with reinforced midfoot support and a reinforced heel and toe to help cushion high-impact areas. Fight back the cold and keep on fishing with the Simms Men's Merino Thermal OTC Socks! Material: 81% Merino Wool, 18% Nylon, 1% Lycra Spandex Heavyweight, hardworking Merino wool over-the-calf sock Naturally wicking and odor resistant Reinforced midfoot support Reinforced heel and toe Sock size Men's US shoe size M 6 - 9 L 9 - 12 XL 12+ Made in the USA