Design: Synthetic leather upper for enhanced durability and upkeep In-Shoe Comfort: Solyte(R) midsole material a lighter weight midsole compound than standard EVA and SPEVA(R) midsoles for enhanced cushioning and durability Durability Traction & Durability: Sharkduo(R) outsole provides increased traction on various track surfaces Pebax spike plate optimizes flexibility while maximizing durability