The On Cloudboom Zone is a PEBA-based uptempo trainer positioned as the everyday companion to the On Cloudboom Strike racer. It’s marketed as a versatile trainer, with “99” stamped on the heel pull tab to imply it can cover 99% of a runner’s mileage, but in practice, it feels in its zone (no pun intended) for faster work such as tempo runs, and the 99% claim is mostly marketing. Unlike plated super trainers that actively propel you forward, this shoe requires more input from the runner’s legs to get the most out of it. That can make workouts feel more demanding, but for some runners, that direct connection and reliance on effort rather than mechanical assistance is exactly what they’re looking for. It departs from On’s usual combination of CloudTec pods and a Speedboard, instead relying on the premium midsole itself for compression and rebound, with only a small plastic shank in the midfoot to add light structure. This makes it more flexible and natural underfoot than a plated shoe, with a lower-to-the-ground, firmer ride that feels more connected, perfect for uptempo mileage.

The Cloudboom Zone fills the gap between daily trainers and super shoes, but it does so differently than plated super trainers, offering an unplated alternative that feels refreshing, especially for high-mileage runners looking for a break from the stiffness of carbon plates.