SmartWool PhD Outdoor Light Pattern Mid Crew Socks - Women's Taupe, S Wool/Nylon/Elastane This sock by Smartwool has a flat knit toe seam for less bulk and light cushioning SW0SW221236 63% Merino Wool, 35% Nylon, % 2% Elastane 4 degree fit system allow for a greater stretch and recovery Mesh ventilation helps with temperature and moisture management