Outer features Vented microfiber upper Personalized double-density rubber sole Rear vertebrae system to ensure controlled flex & torsion Injected & molded plastic protections Three titanium sliders (front, side, rear) Polyurethane gear shift protection A. I.S. (Air Intake System): air intakes for ventilation Velcro & zip closure Side lever closure Shock-absorber insert in the heel Innovative front cambric system with skeletal design that provides increased flex & protection Inner features Air mesh lining Polyurethane nylon reinforcements Soft polymer padding with memory foam TPU Dual Flex with anti-shock felt midsole Antibacterial replaceable footbed with A.P.S. (Air Pump System)