You'll rarely find a lightweight hiking sock with the same reinforced heel/toe protection and strength we weave into our heavy duty boot socks… but look no more. The breathable Merino wool blend insulates when wet, resists odors, and helps regulate your temperature from summer into early fall. Wicking, long-lasting and built for the trail. Made in the USA. Content: 36% merino wool, 35% polypropylene, 20% nylon, 6% elastic, 3% lycra -- Mens shoe sizes: Medium (5-8), Large (9-12), X-Large (13-15) -- Womens shoe sizes: Small (4-7), Medium (8-11)