On Cloudmonster 2 vs On Cloud Eclipse: Which On Daily Trainer Suits You?

Introduction

On paper, the Cloudmonster 2 and the Cloud Eclipse look like close siblings. Both use On’s Helion foam, both carry substantial stack heights, and both sit in a similar weight range. In practice, though, they are built for noticeably different kinds of running. This comparison walks through where they match and where they genuinely separate, so you can decide which one fits your training better, or whether these are the right shoes for you at all.

Specs: Similar On Paper, Different In Hand

In a US size 10, the Cloudmonster 2 weighs in at 304g, about 10.7 oz, while the Eclipse comes in slightly lighter at 298g, around 10.5 oz. The stack heights tell a subtler story. The Cloudmonster 2 measures 36mm in the heel and 29mm in the forefoot for a 6mm drop, while the Eclipse sits higher at 40mm in the heel and 35mm in the forefoot with a 5mm drop.

Those numbers hint at the personality difference: the Eclipse is the taller, plusher platform, while the Cloudmonster 2 keeps things a touch lower and tighter.

Ride Character: Snap Versus Plush

This is where the two shoes really start to diverge. The Cloudmonster 2 behaves like a proper daily training shoe in the midweight range. It retains On’s slightly firmer feel but adds a bit more responsiveness, meaning it handles easy paces comfortably while still being willing to pick things up when you want to run a little faster.

The Eclipse is a different animal. There is more foam underfoot, and the rocker is much more noticeable, but that setup shines at slow speeds. Easy runs, recovery jogs, and even walking feel genuinely good, largely because that slower cadence lets you compress the foam and let the rocker do its work. Try to push the pace and the Eclipse feels large and unresponsive; faster efforts simply do not feel as good in it.

The Cloudmonster 2 is the opposite. Its Cloudtec setup is far less rocker-driven but snappier, with more bounce and a little more flexibility in the sole. If you want a shoe that can move quicker and cover daily paces, this is the better pick. Interestingly, the Cloudmonster 2 is also the one that feels more stable despite being the “faster” shoe of the pair.

Stability: One Has More Guidance Than the Other

Neither shoe is a true stability shoe, but there is a meaningful difference in midfoot support. The Eclipse may look slightly wider on paper, but the way the sole is constructed, the Cloudmonster 2 simply works better for midfoot runners. Its sidewalls are more effective, and the snappy ride tends to push you forward cleanly.

The Eclipse loses a lot of material through the midfoot. If you collapse inward at all while running, there is not much left to catch you. There is a sidewall, but it does not provide the same medial guidance. Lateral support is fine in the Eclipse thanks to the curved setup and a decent sidewall on that side. If you need some guidance or stability, the Cloudmonster 2 is the safer choice; if you are purely neutral, this may not matter much to you.

Upper and Fit: Volume Versus Breathability

Both uppers are genuinely comfortable, but they serve different foot shapes. The Eclipse has the more comfortable fit overall: a lighter upper, better breathability, and noticeably more stretch, leaning toward a normal fit with a slightly wider forefoot that adapts as you run.

The Cloudmonster 2 has a lot of volume. That extra room is great for high-volume feet, but it creates one drawback: the tongue is very thin, and when the laces are cinched down tight, pressure shows up on top of the foot. The Eclipse’s tongue is thin too, but it is padded, so tightening the laces does not cause discomfort. Heel counters and heel fit are fairly similar between the two, though the Eclipse offers a touch more flexibility in the counter, which may suit runners sensitive to firm heel structures.

Which One Should You Buy?

The decision comes down to what your running looks like. If most of your week is easy mileage, recovery jogs, and comfortable cruising, the Eclipse’s plush rocker ride and more forgiving upper make it the natural match. If you want a daily trainer that can also handle quicker paces, with better midfoot structure and more room for high-volume feet, the Cloudmonster 2 is the more versatile option.

Both share Helion foam and comparable weights, so the price of choosing between them is less about performance ceiling and more about ride character and fit preferences.

Conclusion

The Cloudmonster 2 and the Cloud Eclipse are closer twins on a spec sheet than on the road. The Cloudmonster 2 is snappier, more stable, and better suited to varied daily paces and higher-volume feet. The Eclipse is plusher, more breathable, and far more comfortable at slow, easy efforts. Match the shoe to the pace you actually run most, and the choice becomes straightforward.