The Mizuno Wave Inspire 4 running shoe was developed for the runner who desires the best blend of support and cushioning that respects the needs of medium-arched, flexible foot types. Highly ventilated AIRmesh upper provides breathability and comfort. AP midsole provides lightweight, responsive cushioning. Mizuno Intercool�� midsole ventilation system. SmoothRide engineered Composite Double Fan Wave adds great blend of support and cushioning in a package that transitions like no other. VS-1 in the heel to help prevent overpronation. X-10 in heel adds durability. Solid rubber and blown rubber in forefoot offer durability and flexibility. Wt. 8.9 oz.