SIDI Genius 10 Knit Road Shoes You're a Genius! The known comfort of Genius meets a knitted hyper-vented nylon construction. Designed to maintain its shape and structure, the foot is well-stabilized during rides while staying fresh on the warmest days. A carbon/nylon composite sole stiffness 6, SIDI's unique instep closure, and Dyneema high-density dials complete the model for a comfortable premium ride experience. Features Premium dual-layer construction with an engineered ventilated upper High-density resin dialing system with Dyneema Carbon composite sole features a stiffness level of 6, combining performance and greater comfort SPECIFICATIONSUpper Material Ventilated Upper Closure type Dyneema Dialing System Outsole Carbon Composite (Stiffness 6)Cleat Compatibility3-Bolt Intended Use Road | Sidi | Genius 10 Knit Road Shoes Men's | Size 43. 5 In White | Nylon