Product Details Keep your feet warm on cold steelhead drifts, winter trout missions, and late-season walleye runs with the Simms Mens Merino Thermal OTC Socks, a heavyweight over-the-calf layer made from 81% Merino wool for reliable warmth, natural wicking performance, and all-day comfort inside waders or insulated boots. The tall profile shields your legs from chafing, while reinforced midfoot support helps reduce fatigue during long hikes to river access points. A reinforced heel and toe cushion high-impact zones, giving anglers a dependable cold-weather sock that holds up through repeated wading, walking, and boat days. Material: 81% Merino Wool, 18% Nylon, 1% Lycra Spandex Heavyweight Merino wool over-the-calf construction Naturally wicking and odor resistant for long days in waders Reinforced midfoot support for added comfort on the move Reinforced heel and toe for durability in high-impact areas Sock size Men’s US shoe size M 6 – 9 L 9 – 12 XL 12+ Made in the USA Prop 65 Warning Customer Reviews (1) Write a Review 5 Simms Men’s Merino Thermal OTC Socks Posted by Luigi on January 27, 2023 excellent product and great quality excellent product and great quality