Outer lining of Regatta Men’s Blister Protect II Socks crafted from 75% acrylic, 22% polyamide, and 3% elastane. Inner layer is 100% polyamide. Cushioning for shock absorption, ribbed ankle cuff, toe flat seam for extra support. Anti-bacterial treatment protects and inner lining moves with foot to reduce friction. 2-pair pack, ventilation for airflow.