Smooth Speed Assist is Mizuno's signature performance geometry that encourages and supports efficient running form

Sleek and contoured

Using engineering insights from our Advanced Running Concepts (ARC) team

and a lightweight Woven upper enhances the fit and comfort

The upgraded Xero Mesa Trail 2 features a thinner

Women's Saucony Endorphin Speed 4 Colour:White - Navy (Boston) 75 Smooth Speed Assist is Mizuno'sStarting with the midsole, the Endorphin Speed 4 features the same wonderfully soft and responsive PWRRUN PB cushioning that encases a redesigned winged nylon plate. These two elements work with the SPEEDROLL geometry to deliver a highly energetic and efficient underfoot experience. The winged plate adds torsional rigidity in the heel while maintaining flexibility through the forefoot. This offers the stability runners need for cornering and making