Mizuno Running - Wave Alchemy 4 (Grey/Sea/Navy) - Women's: Designed to provide moderate motion control and unsurpassed support in a great fitting package that allows the runner with medium to low, flexible arches that are flexible to perform at the desired level. 24mm/12mm (heel to forefoot ratio. A 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 that provides a great blend of motion control and cushioning for the runner that has low-arched, flexible feet. The Composite Wave is positioned to reduce the rate of pronation in the heel and midfoot phase of the gait cycle. X-10 in the heel for durability. Solid rubber and blown rubber in the forefoot for durability and flexibility. Shoe weighs 12 ounces.