FITS Medium Rugged &ndash; Over the Calf Socks for Camping, Trails & Outdoors 24% nylon FIT: A work sock, a sport sock, a boot sock. Any of these descriptors will fit this rugged work horse. The 100% Merino Wool is knit into a mid-weight construction of terry loops on the inside to control moisture while keeping you comfortably warm. TYPE: An essential style that looks great with your favorite boots and shoes, these socks have high rise that hits just above the calf for added coverage and support. The stretchy welt band keeps them in place for hours even during vigorous activity. CUSHION: These mens outdoor socks feature Merino wool cushioning on the entire foot as well as around the leg so you stay supported and comfortable. The Nylon exterior provides maximum durability and abrasion resistance. INSULATION: The cozy terry-loop interior and elevated thermal insulation wicks away moisture to keep you dry on sweltering days. The nylon high abrasion zones at the heel offer added protection. FABRIC: The soft, durable and breathable fabric is constructed from 69% Merino wool, 24% nylon, 4% polyester and 3% Lycra for a hiking sock that feels great against the skin and moves with your foot for added mobility.