Triad 2.0 OTC SockLayering Position Next to Skin Features Sizing: SM MD (size 40 43) and LG XL (size 44 46) Three Layer Construction: Next to Skin Prolene Polypropylene Insulates, Moisture Manages, and Prevents Odor Mid Layer Merino Nylon Blend Continues Pulling Moisture Away, Managing Odor, and Thermoregulating Outer Layer 100% Nylon for Durability Mid Weight Construction 50% Merino 40% Nylon 8% Polypropylene 2% Spandex Low Profile Toe Seam Top of Foot Ventilation