Synthetic-and-mesh Imported PERFORMANCE SNEAKER: Featuring a breathable knit upper, this trainer is engineered for integrated comfort, cushion, and high performance. It is made for high mileage running and delivers the highest energy return. OPTIMAL SUPPORT: FITZ-RITE midfoot provides soft internal webbing to hold the foot secure, while the strong QUIK SPINE carbon fiber plate adds integrity to the midfoot. The Pressure Free Tongue is designed to provide comfort and avoid irritation. QUIK COMFORT INSOLE: Designed using proprietary foam materials, the insole is molded to provide immediate step-in comfort to increase cushioning while in motion. QUIK FLEX 4FOOT ENGINEERING: Developed to address the natural movement of the metatarsals in the foot. This technology provides a natural, balanced toe-off and enhanced traction and acceleration. QUIKFOAM CUSHIONING: An EVA rubber-blend midsole designed to provide a combination of cushioning and response to maintain a high level of energy return through the life of the sneaker.