The Sugoi WallarooZ Crew Cycling Sock is a warm, comfortable high performance wool cycling sock with the highest calf coverage. This sock is 100% soft, fine merino wool and is inherently odor resistant, breathable, regulates thermal temperatures, and utilizes Sugoi's warmwick and drywick technology.S2 Insulation Layer: SUGOI insulation garments ensure warmth in cold conditions. In helping regulate the climate against your skin, the insulation layer ensures the best possible thermal balance of the body and regulates your core temperature. Soft, fine grade, Merino Wool. Sugoi's Warmwick and Drywick technology wick perspiration from skin to outer surface, spreads moisture from fiber to fiber with capillary action, which helps to dry the garment quickly through evaporation. These features combined create a cool, dry comfort for high exertion activities. Naturally anti-bacterial and itch-free. Extra cushion instep for soothing comfort, and a high density sole for durability. Structured cushioning at footbed and dense cushioning at heel and toe where maximum impact occurs. Supportive arch compression to stimulate circulation and reduce foot fatigue. Fine toe stitching to avoid chafing at toe seam and reduces pressure points to increase comfort. Mesh Ventilation channel to aid in thermoregulation and moisture evaporation. Wallaroo 210 Fabric: 100% Merino Wool.