thorlos Men's T Tennis Thick Padded Roll Top Socks 88% Acrylic, 10% Nylon, 2% Elastane Made in US No Closure closure Machine Wash Impact and friction protection - exclusive thick padding in the ball and heel protects weight-bearing areas of the foot providing comfort and protection clinically shown to reduce blisters, pain, pressure and moisture Constructed with thor-lon fibers for superior softness, resilience, durability, and moisture-wicking for drier, better feeling feet Made in statesville, north carolina, USA 30 day guarantee: Thorlos feel better than ordinary socks. If you do not agree, send the socks and your receipt to Thorlos for a full refund