Invisible layer for your shoes made from sweat-wicking fabric with a supportive fit. The arch support for a secure, stable and comfortable fit. The heel and toe feature a reinforced and durable properties in high-wear areas for comfort and support. Rib cuffs for comfortable fit Arch support for a secure, stable fit Reinforced heel and toe for enhanced durability in high-wear areas Y-stitch heel pocket for a comfortable fit Pack of 3 pairs Size Index: Small: UK 2-5 Medium: UK 5-8 Large: UK 8-11 Extra Large: UK: 11-14