On Running Cloudmonster 2 Review: Worth the Price?

Introduction

The On Running Cloudmonster 2 is one of the most polarizing shoes in the brand's lineup. The original Cloudmonster built a following among high-mileage runners who wanted maximum cushion without crossing into the full-on maximalist aesthetic of a Hoka. The second generation refines that formula: a smoother transition, an updated foam compound, and visual design that's considerably less unwieldy than its predecessor.

But "refined" doesn't mean "for everyone." The Cloudmonster 2 is purpose-built for a specific type of runner and a specific type of run. Used outside those parameters, it underperforms. At $169 to $180, it competes directly with the ASICS Gel-Nimbus 26, the Brooks Glycerin 21, and the Saucony Triumph 22. This review will tell you whether On's flagship cushion shoe earns that price tag, who it genuinely serves, and where it falls short.

---

Price

The Cloudmonster 2 retails between $169 and $180 USD, depending on the retailer and colorway. That positions it firmly in the premium daily trainer segment — not the most expensive shoe in this category, but close.

For context: the ASICS Gel-Nimbus 26 runs $160, the Brooks Glycerin 21 sits at $160, and the Saucony Triumph 22 lands at $150. The Cloudmonster 2 is at the top of that range. Whether it justifies that premium depends almost entirely on how you use it. Buyers reporting premature outsole wear at the heel — some noting visible degradation as early as 150 to 200 miles — have legitimate grounds to question that value proposition. A shoe at this price point should deliver at least 300 to 400 miles of respectable wear under normal training conditions.

If you plan to cycle it in as one of two or three shoes in rotation, particularly using it for easy and recovery days only, the cost-per-mile calculation improves. If you're buying this as your single daily trainer expecting to run it into the ground across all conditions and paces, the math gets uncomfortable.

---

Materials and Construction

Upper: The Cloudmonster 2 uses an engineered mesh that On describes as breathable and adaptive. In practice, it delivers on both counts. The mesh is finely structured — not the looser, more open weaves you'll find on some track-oriented shoes — and it wraps the midfoot with a secure, sock-like feel without requiring an extended break-in period. Ventilation holds up in warmer conditions, though it's not an outlier in this area compared to competitors at the same price.

The heel collar is the weakest structural point on the upper. It's stiff and relatively high-cut, designed to lock in the ankle for a secure ride. For many runners, this works. For others — particularly women with lower Achilles insertions — it creates friction at a vulnerable point. This isn't a material defect; it's a last-design decision that reflects a heel geometry that appears better calibrated to male foot anatomy. It's worth flagging before you commit.

Midsole: This is where On has made the most substantive update. The Cloudmonster 2 uses CloudTec Phase foam, built on the brand's Helion superfoam compound. Helion is a proprietary formulation designed to balance lightweight cushioning with temperature-stable energy return — meaning it doesn't compress and go dead in cold conditions the way older EVA foams do. The oversized Cloud elements — the individual foam pods visible along the outsole — are shaped to facilitate a heel-to-toe rolling motion rather than the more abrupt segmented feel some runners found jarring in earlier On designs.

The result is a midsole that genuinely delivers plush, connected cushioning. The Speedboard — a semi-rigid plastic insert sandwiched within the midsole — provides propulsion structure, preventing the foam from feeling entirely shapeless underfoot. At easy and moderate paces, this works well. At tempo pace or faster, the foam absorbs too much energy and the Speedboard's geometry doesn't compensate adequately. The shoe simply isn't engineered for that use case.

Outsole: Standard rubber coverage, applied selectively at high-wear zones. The traction is adequate for road running and hardpack trails. The durability, however, is a genuine concern. Multiple buyers report heel-zone rubber thinning inside 200 miles — below acceptable for a shoe at this price. On has not publicly addressed this pattern.

---

Comfort

For its intended purpose — easy mileage and long slow distance on pavement — the Cloudmonster 2 is one of the more comfortable road shoes currently available. The CloudTec Phase foam delivers a cushioned underfoot sensation that genuinely reduces fatigue over the back half of a long run. The heel-to-toe transition is smooth and rolling, not abrupt or sloppy. Runners logging 10-plus-mile efforts on roads report significantly less leg fatigue at the end of their runs, which is the core promise of a shoe like this.

The weight is a genuine standout. Given the stack height and visual bulk of the shoe, buyers consistently report being surprised by how light it feels on foot. This matters in practice: a heavy cushioned shoe compounds fatigue over distance; a lighter one doesn't.

Comfort qualifications apply primarily to two groups. First, runners with wider feet or high-volume toes will encounter pinching in the toe box that worsens over longer efforts — a real comfort issue that foam compression doesn't fix. Second, runners with lower Achilles insertions — more common in women — will find the heel collar creates hotspots that no amount of sock adjustment fully resolves. These aren't minor footnotes; they're conditions that can make the shoe uncomfortable enough to sideline a long run.

At easy pace on a flat road surface, for a runner with a standard-volume foot and mid-range Achilles insertion, the comfort delivery is genuine and consistent.

---

Fit and Sizing

The Cloudmonster 2 runs true to size for the majority of buyers. Narrow-footed runners report a secure, well-fitted feel at their standard size with no slippage or excess volume.

The exception — and it's a significant one — is width. The toe box is narrow enough that runners with a wider forefoot or higher-volume toes will feel compression on longer efforts. If you know your feet run wide, go up a half size. This doesn't fully resolve the width issue (you'd need a wide sizing option, which On doesn't offer across all colorways), but it provides marginally more room and reduces the risk of toe pinching at miles 10 through 16.

Women should pay particular attention to the heel collar height in relation to their own Achilles anatomy before purchasing. If possible, try the shoe on and walk or run briefly before committing to a full-distance test. The irritation pattern reported by women buyers suggests this is a meaningful design gap — not a defect, but a fitting consideration that the product description doesn't adequately flag.

Standard fit advice: wear your normal running socks when sizing, run in them for at least 10 minutes if you're testing in-store, and don't assume the plush foam will compensate for a structural fit issue.

---

How to Style It

The Cloudmonster 2 is a running shoe, not a lifestyle sneaker — and it reads that way. The stack height and pod-heavy outsole make it unmistakably athletic. That said, its cleaner second-generation silhouette gives it enough visual cohesion to work beyond the track.

1. Long-Run Outfit
Pair with high-waisted compression running tights, a moisture-wicking cropped tank, and a lightweight running vest in a complementary neutral. The shoe's bold profile benefits from minimal, streamlined clothing. Let the stack height do the visual work; keep everything above the knee clean and close-fitting.

2. Post-Run Recovery Look
Worn with wide-leg joggers in a tonal colorway — charcoal, slate, or cream — and an oversized performance quarter-zip, the Cloudmonster 2 functions as the anchoring element of an elevated athleisure outfit. Choose a colorway that picks up on the jogger's undertone. The On branding reads quietly enough that this combination doesn't look like you're still mid-workout.

3. Gym-to-Street Transition
For days moving from a strength session to errands, pair with fitted training shorts, a ribbed performance bodysuit, and a structured tote. Stick to On's more restrained colorways — the whites, blacks, or muted two-tones — for this application.

---

Alternatives

If the Cloudmonster 2 doesn't check all your boxes, these three alternatives cover adjacent needs with meaningful differences:

1. ASICS Gel-Nimbus 26 ($160)
A more balanced daily trainer with proven outsole durability, a wider toe box option, and a softer, more forgiving heel collar. If outsole longevity and a roomier fit are your priorities, the Nimbus 26 is the more pragmatic choice. It lacks the visual statement of the Cloudmonster 2 but delivers consistent performance across more gait types.

2. Saucony Triumph 22 ($150)
Lighter on the wallet and better calibrated for runners who want plush cushioning with slightly more versatility across paces. The PWRRUN+ foam in the Triumph 22 performs better at moderate effort than the Cloudmonster 2's foam does, making it a stronger choice if you're not exclusively running easy miles. The upper fit is also more accommodating for wider feet.

3. Brooks Glycerin 21 ($160)
The closest competitor in terms of use-case philosophy — a pure easy-day, high-mileage shoe designed for comfort over distance. The Glycerin 21 edges out the Cloudmonster 2 on outsole durability and heel collar comfort, though it doesn't match the Cloudmonster 2's cushion depth or energy return. A more conservative choice for runners who prioritize longevity.

---