Whether it's multiple miles or a few trips around the track, Darn Tough Run No Show Cushioned Ultra-Lightweight Running Socks For Men offer the perfect fit and merino wool performance to keep you blister free. Made of a lightweight Merino Wool blend, these high performance running socks naturally breathe, regulate temperature, and wick moisture away from the foot. Made for running comfort, this ultra-lightweight sock offers a performance fit designed to stop slipping, bunching, and blisters. Soft terry loop cushioning under the foot and in the sock's unique heel tab improve rebound and keep feet comfortable for miles and miles. Built-in arch support alleviates foot fatigue and resists bunching for long-running comfort with zero slippage. True Seamless Toe construction ensures undetectable seam fusion for an ultra smooth, irritation-free feel. Machine wash and dry. Low profile, ultra-lightweight yarns made of 48% Merino Wool/48% Nylon/4% Lycra Spandex create zero bulk socks that feel like a second skin. Machine wash and dry. Mfrs. lifetime guarantee.Manufacturer style #: 1039. 48% Merino Wool/48% Nylon/4% Lycra Spandex Ultra-lightweight, no show running socks Temperature regulating, moisture wicking, Merino Wool blend Low profile, ultra-lightweight yarns - feel like a second skin Performance fit - no slipping, bunching, and blisters Soft terry loop cushioning under the foot and unique heel tab True Seamless Toe construction - irritation-free smooth seams