Thorlos Unisex KLT Hiking Thick Padded Crew Sock 54% Thor-Lon Acrylic, 33% Wool, 10% Nylon, 3% Elastic Turn Inside Out-Machine Wash-Use Liquid Fabric Softner Padding Level: Maximum Cushion Key Benefit: Maximum Protection & Warm Feet = Maximum Comfort Guarantee - Your feet will feel better or your money back! Proudly MADE in the USA | North Carolina Thorlos clinically-tested padding under the ball and heel provides maximum protection from friction, the primary cause of blisters, and impact protection where needed most Constructed with a blend of THORLON and wool blend for additional warmth and superior softness, resilience, durability and moisture-wicking for drier, better feeling feet Cushioning over the toes to help protect against runners toe (black toe) Flat knit instep and cushioning in arch for better fit, more support and less pressure on the feet for a more comfortable hike Fiber Contents: 53% Exclusive THORWICK, 33% Wool/Thorlon blend, 11% nylon, 3% spandex