Give all 33 joints in your foot the freedom to move naturally when you lace up the ASICS 33-DFA 2. Seamless upper construction for a comfortable, flexible fit. ComfortDry liner wicks away sweat to keep feet feeling fresh. Natural33 Last mimics the shape of the foot for a secure heel fit. Lightweight Solyte midsole for durable cushioning. FluidAxis anatomically correct flex grooves are aligned to create a natural running stride. AmpliFoam creates a comfortable, flexible running platform ideal for the foot's natural movements. ASICS High Abrasion Rubber outsole for durable traction. Wt. 9.0 oz.