The ActionHeat battery heated socks are the perfect blend of quality and comfort. The ActionHeat socks reach a maximum temperature of 140F and can last up to 4 hours. The socks have built-In heating panels strategically placed on the top of the toes. The socks are made with high quality cotton and lycra (70% Cotton & 30% Lycra). The set includes 2 ActionHeat Cotton Blend Socks and (2) AA Power Packs.