Royal Racing DH AM Socks 68% Outlast Acrylic, 29% Nylon, 1% Polyester, 2% Lycra Imported Outlast dynamic temperature regulation 230mm rise to encompass ankle and calf Ankle stabilizer Strategically placed cushioning in high impact Zone Re-enforced heel for durability Outlast dynamic temperature regulation 230mm rise to encompass ankle and calf Ankle stabilizer with strategically placed cushioning in high impact zones and a reinforced heel for durability Contoured 'y' heel for increased comforts Thicker arch support