thorlos Men's Tx Tennis Thick Padded Crew Socks 88% Acrylic, 10% Nylon, 2% Elastane Made in US No Closure closure Machine Wash 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 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