SIMMS MERINO THERMAL OTC SOCK – Heavyweight, hardworking Merino wool over-the-calf sock. Naturally wicking and odor resistant. Reinforced midfoot support. Reinforced heel and toe. Over-the-calf height. Made in USA with an 81% merino wool, 18% nylon, 1% Lycra spandex blend. Color is Carbon in SIZES: M-XL.