Full-Length Gel Insoles with Silicon High Quality Arch Orthotic Support. Medical grade soft silicon with great arch support. Softzone Gel Orthotics full-length Gel Insoles with metatarsal pads are made with a non-compressible medical grade silicone which reduces shock loads to the feet, knees, and back. The dual formulation silicone absorbs shock under high pressure areas while supporting surrounding tissue. The Softzone Gel Orthotics Gel Insoles are anatomically designed to provide support to the metatarsals, arch and heel. Multiple vents enhance air circulation for better comfort. The softer density blue colored silicone gel areas provide additional cushioning to sensitive areas.