The Injinji Run 2.0 Lightweight No Show Socks are designed with an anatomical 5 toe construction to properly align the toes, preventing blisters and promoting proper posture and balance. Mesh in the top of the sock provides enhanced breathability, and arch support is built in for a snug, performance fit that prevents slipping. A tab in the rear prevents your socks from slipping down and also prevents abrasion at the Achilles. A reinforced heel and toe makes these socks more durable.