Dual durometer for medial-side or spur/fascia relief for users with flat feet, high arches, or knee conditions, and for helping runners maintain balance
Medium-durometer silicone in main body absorbs impact and recovers quickly
Softer silicone "blue zone" area increases comfort and pain relief from heel spur conditions
Posted design minimizes pronation, flat feet, or genu valgus knee conditions
Retains shape will not deform or degrade with use
Optional anti-microbial cover absorbs odor, prevents bacterial growth and allows foot to slide easily into the shoe
