Thorlos Unisex JMX Running Thick Padded Ankle Sock 85% Thor-Lon Acrylic, 14% Nylon, 1% Elastic Made in US Turn Inside Out-Machine Wash-Use Liquid Fabric Softner Constructed with THOR-LON fibers for superior softness, resilience, durability, and moisture-wicking for drier, better feeling feet. Cushioning over the toes to help protect against runner's toe Flat knit instep and cushioning in arch for better fit, more support and less pressure on the feet for a more comfortable run. Low profile toe seam won't rub or irritate the feet. Unique padding specifically engineered for running, clinically shown to reduce blisters, pain, pressures and moisture for maximum protection.