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: Medium by Ariat