These lightweight socks feature foot ventilation and a half cushion sole for all-day wear. Our URfit system provides long-lasting support for any adventure that comes your way. Great fit and support mean you&';re cushioned, dry, and comfy no matter where you end up. Women&';s fit URfitA(R) System provides arch support and memory-knit construction Vented paneling helps remove moisture and keep you dry Reinforced toe and heel provide durability and add to sock life Smooth, flat knit comfort toe seam 31% Merino wool, 31% acrylic, 30% nylon, 6% polyester, 2% spandex