Dahlgren Trainer Socks Toe, Heel, Wicking Channels: 55% Merino Wool, 27% Nylon, 18% Alpaca Body: 75% Polyester, 23% Nylon, 2% Spandex Made in US Patented DriStride technology absorbs transfers and removes moisture keeping feet drier and more comfortable all day long Snug arch support to reduce fatigue Cushion under foot only; Flat knit everywhere else for comfort without bulk Dual-tab ankle reduces friction blisters at ankle Dual-tab ankle protects from shoe abrasion Alpaca/Merino wool in wicking channels absorbs moisture; ThermaDri Hydrophobic transfers moisture out of sock keeping feet drier, more comfortable