Engineered to give you that floating feeling while you run, the Mizuno Wave Sky 4 keep you light on your feet thanks to the inclusion of new Enerzy foam technology. Enerzy foam combines with FoamWave in the midsole to deliver a sensational, energy returning experience underfoot. Softer and more breathable than ever, the new Jacquard mesh upper is perfect for long runs providing the ideal blend of flexibility and structure. Feel lighter in your step and run confidently in the Mizuno Wave Sky 4. Features Jacquard mesh upper offers a soft breathable fit New collar construction provides a more comfortable, locked-in feeling FoamWave technology provide stability and cushioning underfoot Mizuno Enerzy foam underfoot enhances energy return for a softer, bouncier running experience.