Trail Running / Mountain Racing 50.6% nylon, 21.4% polyester, 20.8% cotton, 7.2% spandex COOLMAX® yarns wick sweat fast to keep feet dry and cool Lycra® delivers a snug, adaptive fit for all-day comfort Targeted compression at arch and ankle enhances stability and prevents slipping Terry cushioning absorbs impact and reduces fatigue on toe and heel Breathable mesh upper improves airflow and speeds up moisture release Seamless toe construction minimizes friction and blister risk Ergonomic 3D heel locks the foot in place for a secure, non-slip fit Left/right specific design ensures natural, precise comfort Antibacterial treatment helps control odor and keeps socks fresher longer Size: S / M / L