The adidas Supernatural Extreme Fire Storm running shoe is the closest thing to being self propelled. A new, improved Megabounce heel cushions even better, turning every impact into forward momentum. And that makes any run more fun. Textile and synthetic upper. adiPRENE®+ insert for forefoot propulsion and efficiency. Bounce® technology provides optimized energy return and step-in comfort. adiWEAR® outsole for best durability in high-wear areas.