Formula G rubber with clipless pedal specific tread pattern. STI Evolutionå¨ Foam midsole. Nylon clipless pedal shank optimized for pedaling efficiency and off bike walkability. Pro Foam 1 formed PU footbed. Exo-Shield upper, lightweight, breathable, and protection where it‰?s needed. Adjustable Power Strap for extra lockdown. Repel treated upper blocks moisture. The Lace Lock on the tongue keeps laces in place. Lace Guard asymmetric lacing keeps laces protected from pedals. Nylon pull loop on heel and tongue. System Flo2 Compression Tongue provides air flow to the foot and keeps debris out. Reflective heel panel for safety.