These midweight, premium-quality performance socks are constructed to deliver superior durability. Arch support reduces foot fatigue while a touch of stretch helps keep them firmly in place. Comfortable seamless toe Ultra durable contruction for long wear Reinforced zones for added durability Arch support to reduce foot fatigue LYCRA® Spandex prevents sock from falling down 37% Merino wool, 37% acrylic, 24% nylon, 2% LYCRA® Spandex Made in the USA of imported and domestic materialsMidweight Merino Wool Blend Over The Calf Steel Toe Work Sock | Midweight Merino Wool Blend Over The Calf Steel Toe Work Socks in Grey Spandex, Size: XL by Ariat