Crafted with high-quality materials, the outer layer consists of 36% REPREVE® Nylon 6, 21% cotton, 12% acrylic, 11% wool, 18% polyamide, and 2% elastane. The inner layer is composed of 99% REPREVE® Nylon 6 and 1% elastane, ensuring durability and performance.For easy maintenance, machine wash the Fusion Walk Sock at 30 degrees.