thorlos Men's Trail Hiking Moderate Padded Crew Socks 87% Acrylic, 12% Nylon, 1% 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 thorlon 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