Mizuno Running - Wave Alchemy 5 (White/Yellow/Navy) - Women's: Designed to provide excellent motion control, a smooth transition, and exceptional cushioning in a lightweight package for the runner with medium to low, flexible arches. SmoothRide(R) engineered Composite Double Fan-Shaped Wave that utilizes a framework of pebax for the uniform dispersion of shock with polyester inserts to provide an impact zone with optimal cushioning properties. The end result is a wave that provides a great blend of motion control and cushioning for the runner with low-arched, flexible feet. The redesigned composite Double Fan-Shaped Wave(tm) provides a smooth transition by reducing the shock vibration inherent to running. Solid rubber and blown rubber in the forefoot for durability and flexibility. 24mm/12mm (heel to forefoot ratio.