NIKE Women's Everyday Lightweight Footie Training Socks (3 Pairs) 70% Cotton/27% Nylon/3% Spandex Y-stitch heel pocket for a comfortable fit Mesh panels for enhanced ventilation Reinforced toe for durability in high-wear areas Silicone grip tape on the inside of heel helps keep sock in place Small (4-6); Medium (6-10); Large (10-13)