Made from high-strength medical-grade silicone. It absorbs the pressure and shock exerted by body weight on the foot, knee and ankle. Provides uniform pressure distribution thanks to the different silicone densities. The blue silicone (on the metatarsal and heel) is softer to better absorb pressure in these areas of the foot. The perforated surface ensures smooth airflow and allows the foot to "breathe". Size: 44-46