GelStep® orthotic insoles are made from 100% medical-grade silicone. Specifically designed to absorb shock, relieve pressure and provide biomechanical support and pronation control. ‘Blue Zone’ comfort spots feature softer Silicone for extra protection in high-impact areas. This dual-durometer design provides maximum comfort and cushioning. Available uncovered or with an odor-control, anti-microbial top cover to help absorb perspiration, reduce friction and improve comfort.