Speed 300 IGNITE PWRCOOL Running Shoes:Cooler = Faster. The Speed 300 IGNITE PWRCOOL is all about making you faster while keeping you cool in those hot summer months. It incorporates two new performance features whilst maintaining an extremely low weight. Its midsole features IGNITE, PUMA's superior cushioning PU foam formula that disperses impact forces while providing optimal responsiveness and energy return. An engineered forefoot Propulsion Zone in the outsole propels you forwards, generating more speed through the toe-off phase. Built to perform, this neutral running and training shoe will make you feel light and fast on your feet at an 8 mm heel-to-toe drop.Smooth operator with neutralCELL.Open AirMesh for breathability and comfort.Thermo-regulating Comfortemp tongue lining.Reflective overlays for visibility and safety.IGNITE Foam midsole for high-rebound cushioning.EcoOrthoLite® sockliner for increased comfort.Cooling Dri-Freeze heel and sockliner material.Propulsion Zone provides a reflex energy return.EverTrack+ for cushioning and a smoother toe-off.