Wigwam Men's Merino Airlite Pro Socks 34% Merino Wool, 32% Nylon, 27% Dri-Release, 6% Spandex, 1% Polyester Made in US Machine Wash Ultra-lightweight Merino Wool hiking/outdoor/casual crew socks enhanced with Drirelease with Tencel for superior moisture control and dry feet. Merino wool for softness and warmth Ultimax design keeps feet dry and blister free Ultra-lightweight sole and seamless toe closure enhances comfort Lifetime Guarantee