On Running Reviews


The On Cloud X is a lightweight and energetic performance trainer that’s fast and agile enough for race-day, but cushioned enough to be an everyday trainer.


The Swiss-engineered On Cloud X is a lightweight and energetic performance trainer that’s fast and agile enough to be a race-day shoe but cushioned enough to be an everyday trainer for many runners.

The Cloud X It features On’s unique Cloudtec cushioning system and a full-length engineered plastic plate for maximal responsiveness in every stride.

On Cloud X - What's New?


The Cloudtec cushioning pods on the Cloud X have been enhanced with a new Zero-Gravity Foam. This works in concert with the lightweight Speedoard plate that helps propel the foot forward from touch-down to toe-off. A new engineered, knit-weave mesh upper provides more benefits. These range from enhanced foot security, better breathability and a sock-life fit that are ideal for fast workouts.

The engineered, knit-weave mesh upper has a sock-like fit. This holds the foot in place at the saddle/arch. Consequently, this also moves with the natural flex of the foot and allows the toes enough room to wiggle.

The seamless tongue, bootie construction, seamless interior and cushy sockliner create a smooth, secure irritation-free fit.

The outsole features smartly placed sections of an adhesive rubber compound under the heel and forefoot that provide reliable grip on wet and dry pavement and optimal durability. 

On Cloud X 2020


The Cloud X fits like a glove. With a soft, dual-density sockliner, smooth tongue, elastic laces and an upper that conforms to your feet, the Cloud X provides a comfortable, custom fit.

Adeptly, they feel moderately soft, very light and extremely dexterous once you lace it up. These sensations all remain on the run.

The Cloudtec cushioning pods move with the natural motion of your feet. They provide just the right amount of cushioning in every phase of the gait cycle.

The ride feels lively, low-to-the-ground and especially nimble, offering great proprioceptive feel for the road — especially at faster paces. They don’t give off a bouncy or marshmallowly sensation, but instead a feeling of consistent smoothness.


A runner interested in a lightweight, smartly cushioned shoe for with energetic pop will love this shoe. It’s on point for tempo runs, interval workouts and races from the mile to the half marathon.

The On Cloud X also feels great for medium to longer runs at any speed.

On Cloud X - Pros

Pros: On Cloud X

The engineered, knit-weave mesh upper and performance-oriented elastic laces offer a comfortably snug fit.

On’s dynamic new Zero-Gravity Foam is both absorbent and extremely energetic. It keeps weight to an absolute minimum and provides maximum mobility and smoothness in every stride. 

The Cloud X is versatile enough to be worn for other types of gym-based workouts and looks and feels great as a casual lifestyle shoe too. 

On Cloud X - Cons

Cons: On Cloud X

Although the cushioning is dynamic and consistent, it’s not as abundant as some other shoes.

Runners who appreciate more cushioning and less “feel” for the road might feel the midsole of this shoe is too minimalist.


On Cloud X - Tech Specs



Brian Metzler has run races at every distance from 50 meters to 100 miles, wear-tested more than 1,500 pairs of shoes, is a three-time Ironman finisher. He occasionally participates in the quirky sport of pack burro racing in Colorado.

He’s the founding editor of Trail Runner magazine, is a former senior editor at Running Times and editor in chief at Competitor Magazine. He’s the author of “Kicksology“, “Running Colorado’s Front Range” and the co-author of “Natural Running: The Simple Path to Stronger Healthier Running” and “Run Like a Champion: An Olympian’s Approach for Every Runner.”

Brian Metzler - trail running
Brian Metzler - Trail racing
Brian Metzler - Les Alpes