Synthetic-and-mesh PERFORMANCE SNEAKER: Featuring a seamless engineered mesh vamp, a Pressure Free Tongue that?? designed to provide comfort and avoid irritation, and a full ground contact outsole for a more natural ride. 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. 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.