Mizuno Wave Enigma 5 running shoes feature an evolutionary midsole called U4iCX which delivers a stress-free, cushioned ride for a super-energized experience. Smoother transitions and a glove-like fit from the upper create the ideal foot environment. These neutral shoes are lightweight, resilient and flexible. You’ll love the new sleeker look and fresh colors.Upper: Airmesh helps maintain a high standard of breathability and comfort. Padded tongue and heel collar enhance comfort. Lace-up front offers an adjustable fit.Midsole: Pebax RNEW is a sustainable compound made from plant-based oil and low-carbon production while retaining high performance characteristics. U4iC midsole compound provides high comfort and performance while being extremely lightweight. U4iCX is an evolutionary lightweight midsole that delivers stress-free cushioned rides with high rebounds. SmoothRide minimizes the rapid acceleration and deceleration of the foot during transition, creating the smoothest ride possible. Mizuno Wave Technology provides both cushioning and stability that dissipates impact forces away from the foot for a smoother, more cushioned feel on every step. Removable insole.Outsole: X-10 provides extremely durable carbon rubber that allows for longer wear in high impact areas and provides more traction at the heel strike.