Trail Running / Mountain Racing 50.6% nylon, 21.4% polyester, 20.8% cotton, 7.2% spandex COOLMAX® yarns wick away moisture quickly to keep feet dry and fresh Lycra® provides a snug, comfortable fit Breathable mesh structure enhances ventilation and accelerates moisture release Terry cushioning on toe and heel reduces pressure during movement Arch support design keeps the sock securely in place Seamless toe construction minimizes friction and enhances comfort Ergonomic Y-shaped heel ensures a locked-in, non-slip fit Polygiene® treatment helps inhibit odor and keeps socks fresher for longer Size: S / M / L