Train harder with CSG! Crafted with polyester blend fabric and a small percentage of rubber and spandex in their anatomy, the CSG Repreve Train 3 Pack No Show Socks stretch to fit your arches perfectly and cradle your feet in comfort. Designed with a compression arch, ribbed lace pad, and zonal cushioning, these CSG socks are the perfect gear for your rigorous training sessions. CSG Repreve Train 3 Pack No Show Socks features: Compression arch holds the sock in place and supports the plantar fascia. Zonal cushioning reduces friction and resists bunching. A ribbed lace pad protects the top of the foot. Mesh ventilation adds breathability. 59% polyester/35% Repreve polyester/4% rubber/2% spandex. Imported.