Runners will stay ahead of the pack in ultra-lightweight, road-hugging Mizuno Wave Hitogami 4 running shoes. The low profile delivers speedy turnover and a secure fit that leads to explosive acceleration. The updates to this racer include an even lighter and flexible mesh upper and more responsiveness from the midsole. Upper: AIRmesh™ provides optimum breathability and comfort. Lace-up front provides an adjustable fit. Midsole: Parallel Wave offers fast, responsive cushioning. U4iC midsole provides resiliency and a smooth ride at a fraction of the weight of traditional midsoles. Removable insole. Outsole: Blown rubber in forefoot provides improved durability, softness and grip. X10® durable carbon rubber delivers longer wear in high impact areas and supplements traction at heel strike. SmoothRide Engineering™ creates a smooth, rocking-chair-like transition from heel to toe.