These lightweight crew socks are made from super soft, all-natural Alpaca. Our URfit® System provides long-lasting support for adventure and all day wear. 37.5® Technology helps regulate your foot temperature and strategic micro-cushioning help to make sure you're comfortable no matter where you end up. Wick Dry™ technology keeps your feet dry and helps avoid moisture build up that leads to hot spots and blisters. Unisex fit URfit® System provides arch support and memory-knit construction Contoured arch adds support and keeps sock in place Micro-cushioned heel and toe provide shock absorption and comfort Reinforced heel and toe provide added durability Mesh panels at top of foot carry air upward for cooling and ventilation Smooth, flat comfort toe seam 44% nylon, 33% polyester, 15% alpaca, 4% acrylic, 4% spandex Style #1405