The Bellingham Sock from Keen is made from temperature-regulating, moisture-wicking merino wool with an Anatomical Flex Fit System that reduces bunching for all-day comfort and security. Extra cushioning on the bottom absorbs impact. Reinforced toe and heel offer durability. Y-shaped heel pocket design creates a better fit. Ravel-free double welt top keeps socks up. Seamless construction. Keen offers right and left-foot specific socks for the best possible fit. Crew sock rises to just below the calf. Lite fabric weighs just 1.9 oz. 50% merino wool, 43% nylon, 5% polyester, 2% Lycra spandex.