Wave Sky 9 vs Aero Glide 4

The Wave Sky 9 is Mizuno's plush, max-cushion daily trainer, a soft running shoe built to soak up easy miles and long runs rather than chase pace. With 44.3mm of stack under the heel and a moderate 6.2mm drop, it plants a deep, protective platform between your legs and the road, and that is exactly where it does its best work. At 295g it is a substantial shoe, so nobody will mistake it for a tempo tool. That heft is the trade-off for the comfort. If you want a neutral cushioned trainer to protect tired legs across a marathon build, or a plush recovery-day cruiser, it earns its place. If you already run in the Asics Gel Nimbus 28 or another pillowy daily trainer, the Wave Sky 9 sits squarely in that same comfort-first bracket, and we rate it as an honest, dependable option rather than a flashy one.

The Salomon Aero Glide 4 is the brand's big-cushion road running shoe, built for soaking up easy miles and long runs without asking your legs for anything back. With a tall 43.2mm heel stack and no carbon plate, this is a comfort-first daily training shoe rather than a racer. What sets it apart from most max-cushion rivals is the tall 11.7mm drop, which rolls you forward off a generous heel and suits runners who land heel-first. It is not the lightest shoe in the class at 250g, and it is not trying to be snappy. What you get instead is a soft, planted, protective ride that stays comfortable when the miles pile up. If you loved the Aero Glide 3, this is a familiar, refined take on the same idea. We rate it as a dependable cushioned trainer for steady runners who value comfort over pace.