Wigwam Men's Portland Pro Lightweight Outdoor Peak 2 Pub Crew Sock 38% Nylon, 37% Polyester, 17% Merino Wool, 5% Lyocell, 3% Spandex Made in US Machine Wash Usa manufactured with a 2 year performance guarantee The combination of merino wool and patented dri release engineered blend keeps feet dry, odor and blister free Wigwam 100+ year legacy of proven fit, comfort and durability Peak 2 pub versatility Men's sock sizes - medium (fits US shoe size 5-9.5), large (fits US shoe size 9-12), x-large (fits US shoe size 12-15)