Mizuno Wave Sky 7 Running Shoes Offering a higher level of "floating run experience" than their predecessors, the Wave Sky 7s feature Mizuno Enerzy Core for excellent cushioning and energy return, Mizuno Wave technology for great stability, and woven materials for a soft and smooth fit. Stretch Woven Upper Providing you with an exceptional level of comfort and breathability, enhancing performance, the Wave Sky 7s utilise a stretch woven upper. The woven materials allow air to flow freely through the construction of the shoes, to ensure that feet remain cool and comfortable when training and running. Mizuno has reduced the thickness of the fabric and adopted a newly updated design that weaves air vents into the vamp for assisting breathability. The upper materials are soft and smooth to prevent irritation or chafing from occurring, whilst are also stretchy to allow feet to move more comfortably and freely for an enjoyable experience. A traditional lace-up system