67% Merino Wool / 29% Nylon/ 4% Lycra Made in US MID-CALF HEIGHT: A go-to, working height that’s always ready to take on more. For a shorter sock, check out style 1657. LIGHT CUSHION: Light and strong with a thin layer of cushioning along the base of the foot. Darn Tough's most versatile construction. For a sock with less cushion, check out style 1480. COMPOSITION: Crafted with 47% Nylon, 46% Merino Wool, 7% Lycra Spandex. 1441 stitches per square inch provides extra cushioning, durability, and a foot hugging fit. GUARANTEED FOR LIFE: Darn Tough's famous guarantee - if these socks wear, tear, or develop holes, Darn Tough will replace them no questions asked. No strings. No conditions. MADE IN THE USA: Every pair of socks is knit in Northfield, Vermont - the perfect testing ground for the finest premium all weather performance socks.