On Cloudmonster vs Cloudstratus 3: Which Max-Cushion Trainer Deserves Your Miles?

Introduction

On’s max-cushion line has two obvious contenders: the Cloudmonster, a long-standing favourite among easy-day trainers, and the newer Cloudstratus 3, which On markets as a no-compromise cushion shoe built for eating distance in comfort. Both promise big stacks, rockered rides, and long-run protection, but they are not interchangeable. We compared them side by side, including running one shoe on each foot, to find out where each one actually wins.

At a Glance: Specs and Prices

On does not publish official stack heights for either shoe, but both pack roughly 30mm or more in the heel with a 6mm drop. The Cloudstratus 3 is the heavier shoe of the pair at 11.3oz (320g) in a UK men’s 8.5, while the Cloudmonster comes in at 9.8oz (278g). For women’s sizing the gap persists too: in a women’s UK 7 the Cloudstratus 3 weighs 271g versus 259g for the Cloudmonster.

Price matters here as well. The Cloudstratus 3 costs £170 / $180, which is £20 and $10 more than the Cloudmonster at £150 / $170.

Design and Midsole Construction

Both are big shoes on the maximalist side, with similar midsole heights and overall cushioning. The core construction is nearly identical: Helion foam and a nylon speedboard in each. The key difference is that the Cloudmonster uses a single large stack of Helion foam clouds, while the Cloudstratus 3 goes for a double stack of Helion clouds, a layout On is increasingly using on its more cushioned models. Both shoes feature substantial rockers up top.

The uppers diverge. The Cloudstratus 3 has a perforated upper that is more airy, with notably more plushness overall: extra padding in the heel collar and tongue, plus an external heel clip for added support. The Cloudmonster’s upper is denser and more lined, with just an internal heel counter, though the toe box is slightly wider and roomier.

Flipping them over, the Cloudstratus 3 has a bit more outsole rubber coverage and removes the large channel found under the Cloudmonster, which acts as a stone catcher and is a known annoyance on many On shoes.

Fit and Sizing

Fit feedback is mixed between testers, so plan accordingly. One tester found the Cloudmonster came up short in the foot and would size up half a size, while finding more room at the top of the foot in the Cloudstratus 3. Another tester ran true to size in both shoes in a UK 8.5 and got a good fit from each, with solid toe box room in both.

The practical takeaway: consider going up half a size in the Cloudmonster if you are between sizes, and be ready to pay attention to lacing on the Cloudstratus 3, which needs tighter lacing across the midfoot for a secure hold.

Ride Feel: Which Shoe Rolls Better?

Both shoes are best suited to easy miles and longer runs, but they do not feel identical underfoot. The Cloudmonster’s rocker feels more pronounced, rolling you quickly through the forefoot into your next step, producing a firmer, snappier, more responsive ride. It is lighter and more compact on the foot, and it is the only one of the two where you could plausibly pick up the pace for tempo work, though neither is a speed-session shoe.

The Cloudstratus 3 is plusher and softer at landing, with more of a sinking feel thanks to that double layer of clouds. It feels heavier, flatter, and clumpier, with little impetus to speed up. At slower paces you notice the extra plushness, but at running speed most of that seems to come from a slightly thicker insole rather than extra squish from the dual-layer midsole. On stability there is little to choose between them, both are solid, stable shoes.

Durability and Mileage

Test mileage to date favors the Cloudmonster: well over 100 miles across a mix of paces on road and light off-road, versus around 20 miles in the Cloudstratus 3. The Cloudmonster has proven itself a dependable daily trainer best for easier-end miles, while early impressions of the Cloudstratus 3 are of a perfectly reliable cushion cruiser that did not fully win over testers on those first runs. Both are built for long miles in cushioned comfort, so expect both to hold up as distance shoes.

Our Verdict

The Cloudmonster edges it overall. It is cheaper, lighter, and more natural on the foot, with a firmer, snappier, more agile ride, and it has enough gears to handle faster pickups that the Cloudstratus 3 struggles with. It is plenty plush for long-run comfort, doing everything the Cloudstratus 3 does and more at quicker paces.

The Cloudstratus 3 still makes sense for a specific runner: if you want the softest, most sink-in, plusher ride for easy runs and long marathon-training miles, especially when your legs are tired, the extra cushioning and padding are genuinely lovely, and it is the better pick if you also use the shoe for walking. If you are not chasing that sink-in comfort, the Cloudmonster is the safer bet.

Conclusion

These shoes share Helion foam, a nylon speedboard, similar stack heights, and the same 6mm drop, so the differences come down to feel: the Cloudmonster is lighter, snappier, more versatile, and cheaper, while the Cloudstratus 3 is plusher and softer underfoot. Pick the Cloudmonster if you want one cushioned trainer that can do easy miles and occasional pickups. Pick the Cloudstratus 3 if maximum soft, sink-in comfort is the priority, regardless of the extra weight and price.