Mizuno Wave Sky 9 First Run Review: A Comfortable Cushioned Workhorse

Introduction

The Mizuno Wave Sky 9 is a cushioned daily trainer designed for all-out comfort over easy runs and longer daily sessions. It costs £165 or $180, weighs 292 g (10.3 oz) for men in a size 8, and has a 6 mm drop. Mizuno says cushioning and energy output have both been significantly enhanced in this version, and the shoe adds a foam wave design for a touch of stability.

Fit and Comfort

Sizing true to UK size 8, the Wave Sky 9 offers a very comfortable, plush fit. There is plenty of space before the big toe, a fairly roomy forefoot, and a secure midfoot for average-width feet. Padding is generous everywhere that matters: a well-padded tongue and plenty of cushioning around the heel.

The upper is a stretch woven material that contributes to the high comfort level, and the overall feel is one of a shoe designed with relaxation in mind rather than speed.

On the Run

The midsole combines nitrogen-infused Mizuno Enerzy Next foam, which is soft and bouncy, with a firmer layer of Enerzy Next EVA underneath for support. Heel cushioning is increased by 6 mm in this version, and the shoe is a bit wider than average.

That firmer lower layer does a lot of work here. It offsets the softer upper midsole, which takes away some of the softness you might expect from the Enerzy Next foam alone. On the run, the result feels closer to a more traditional cushioned shoe: stable, slightly denser, and comfortable rather than marshmallow soft. It holds the foot in a good position and moves you forward nicely over easy 10K pace.

Where it falls short is versatility. Picking up the pace revealed a shoe that feels a little heavy and lacks the turnover you would want for faster running, and the transition is not smooth enough to make it a first choice for marathon training.

Things to Consider Before Buying

The outsole impressed, with a thick layer of rubber extending across the whole shoe and only some exposed sections. That points to good durability, exactly what you want from a shoe meant to cover a lot of easy miles.

This is not an exciting shoe, and it does not push the boundaries of cushioned trainers. It sits in the same realm as shoes like the Brooks Glycerin 22 or Triumph 23: solid shoes for everybody rather than performance statements.

If you are a heavier runner, you may get more out of the softer upper midsole while still benefiting from the stability of the firmer lower layer.

Who It Is For

The Wave Sky 9 is best understood as a comfortable, cushioned, high-stack shoe designed for everyone. It works whether you need a bit of stability or not, and it is a genuine workhorse for easy runs, recovery runs, and the kind of comfortable 10K to 15K outings many runners do most of the time.

Beginners who want some built-in stability, general runners after a reliable easy-day shoe, and anyone who values plush comfort over pace will get the most from it.

Buying Advice

If comfort, a bit of stability, and durability are what you are after, the Wave Sky 9 is a good option. Just do not buy it expecting versatility or a lively ride at faster paces.

Conclusion

Over its first runs, the Mizuno Wave Sky 9 proved a solid, comfortable cushioned cruiser that does exactly what it promises. It will not surprise you, but as an easy-mile workhorse with a stable two-layer midsole and a durable outsole, it ticks a lot of boxes.