Fox River Heavyweight Steel Toe Wool Mid-Calf Boot Sock Wool Blend 88% wool, 10% nylon, 1% acrylic, 1% spandex Fully cushioned sole absorbs shocks and insulates Extra cushion around back of heel and over toe for steel-toe boot protection Reinforced toe and heel add durability and longer sock life and increase comfort when wearing steel toe boots Special front vamp helps eliminate bunching and bulk at ankle