Thorlos Unisex XT Fitness Padded Crew Sock 83% Exclusive THORLON Acrylic , 12% Stretch nylon , 5% Spandex Turn Inside Out-Machine Wash-Use Liquid Fabric Softner Padding Level: Moderate Cushion Key Benefits: Maximum Protection = Maximum Comfort 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 Cushioned instep and arch plus spandex for a better fit, more support and less pressure on the feet for more comfort while exercising Constructed with THORLON fibers for superior softness, resilience, durability, and moisture-wicking for drier, better feeling feet Low profile toe seam wont rub or irritate your foot Fiber Contents: 83% Exclusive THORLON Acrylic , 12% Stretch nylon , 5% Spandex