Using high-tenacity nylon fibers that are 15% stronger than steel, Dura-Zone areas in the heel and toe areas ensure exceptional durability and comfort. Right-angle heel-cup construction ensures a secure, natural fit. Wunderseam in the toe’s flex zones eliminates bunching and is seamless so you won’t even feel it’s there. Light cushioning. 46% merino wool, 34% nylon, 10% polyester, 8% Dyneema polyethylene, 2% spandex. Per pair. Made in USA. Sizes: L, XL. Colors: Gray, Black, Slate Black.