Lightweight sock that features Wick Dry?? moisture management technology and made from Merino wool. URfit??? System provides long-lasting arch support and memory-knit construction for adventure and all day wear. Vented panels remove moisture and keep you dry. Reinforced toe and heel add comfort and longer sock life. Smooth, flat comfort toe seam. Great fit and support mean you're cushioned, dry and comfy no matter where you end up. 42% nylon, 28% Merino wool, 28% acrylic, 2% spandex. Lightweight.