Mizuno Wave Catalyst running shoes are a great reason to add more miles to your goal thanks to the lightweight, responsive feel. They feature a midfoot landing area that accommodates heel and midfoot runners. Ideal for runners seeking guidance. Upper: Classic 3D Fit delivers conforming support. AIRmesh™ provides the utmost in breathability and comfort. Synthetic overlays deliver lightweight support. Padded tongue and heel collar enhance instep comfort. Lace-up front provides an adjustable fit. Midsole: Fan Wave provides structural guidance. Mizuno Wave U4ic midsole delivers optimal shock attenuation, durability and a superior ride that's 30% lighter than AP+. Wave Technology® dissipates impact forces away from the foot for a smoother, more cushioned feel on every step. Removable insole.Outsole: Blown rubber in the forefoot offers improved durability and softness. X10® durable carbon rubber delivers longer wear in high impact areas and supplements traction at heel strike. SmoothRide Engineering™ minimizes the rapid acceleration and deceleration of the foot during transition, creating the smoothest ride possible.