The Mizuno Wave Nirvana 5 running shoe provides support to the medium-arched, flexible foot type. AIRmesh™ upper provides the utmost in breathability and comfort. Dynamic Fit design technology relieves the stress the foot naturally places on footwear- eliminating distortion for the perfect fit. AP midsole provides lightweight, responsive, yet durable cushioning. Mizuno Intercool™ full-length midsole ventilation system reduces heat and humidity build up inside the shoe. SmoothRide™ Composite Double Fan-Shaped Wave™. VS-1™ shock absorbing cushioning compound. X-10™ durable carbon rubber allows for longer wear in high impact areas and supplements traction at heel strike. Wt. 12.9 oz.