1Several reviewers describe the On Cloudultra Pro as notably soft, cushioned, and comfortable underfoot, with a plush feel that distinguishes it from firmer trail shoes and even from the regular Cloudultra 3.
Buyers seeking a soft, forgiving trail super shoe for long days will likely find the Cloudultra Pro comfortable, though that softness comes with trade-offs in stability on technical terrain.
3 creators9 opinions
Opinions (9)
Humble Running observes that the Cloudultra Pro's ride is very smooth and feels more like a training shoe or all-around versatile shoe, not a crazy aggressive plated super shoe.
On Cloudboom Strike 2 Review // Why Trail Supershoes Play by Different Rules3:54Humble Running finds the Cloudultra Pro noticeably softer and more cushioned under the forefoot than the Cloudultra 3, and also noticeably more reactive underfoot.
On Cloudultra 3 vs Cloudultra Pro // Full Review & Comparison3:58Humble Running describes the Cloudultra Pro as one of the friendliest trail super shoes, with a soft cushion feel that is comfortable without the plate feeling intrusive or overly aggressive, comparable to an enhanced daily trainer.
On Cloudultra 3 vs Cloudultra Pro // Full Review & Comparison15:43RoadTrailRun observes that the On Cloudultra Pro is somewhat softer and more easygoing than many On shoes.
Compared! Rocket X Trail, Cloudultra Pro, Cascadia Elite, Terrex Speed Ultra 2, Nike ACG Ultra Fly 29:12TF XC Running Shoe Reviews (TF XC) finds the On Cloudultra Pro midsole was very cushioned and super comfortable for being out on the trail all day.
On Cloudultra Pro First Impressions Review & ComparisonsWatch sourceHumble Running finds the On Cloudultra Pro feels very soft and very ultra soft.
On Cloudultra - More Runner Feedback // NNormal Surprise // Kilian Bonus!0:12- Humble Running
Frederick finds the On Cloudultra Pro is a bit more plushy, a bit more edible, and a bit softer than the regular Cloudultra.
On Cloudultra - More Runner Feedback // NNormal Surprise // Kilian Bonus!0:12 - Humble Running
Frederick finds the On Cloudultra Pro is definitely more comfortable than the regular Cloudultra, and does so immediately.
On Cloudultra - More Runner Feedback // NNormal Surprise // Kilian Bonus!0:12 Humble Running compares the feel of the Kiprun Kipsummit Race to the On Cloudultra Pro, finding the On Cloudultra Pro to have a real softer, more squishier feel underfoot compared to this shoe.
Kiprun KIPSUMMIT RACE // The Next TOP Trail Super Shoe?16:06
2Multiple reviewers praise the Cloudultra Pro's toe box as spacious, rounded, and among the best of any trail super shoe, accommodating wide forefeet and preventing toe rub.
Runners who prioritize toe splay and forefoot room — especially for ultra distances where feet swell — should find the Cloudultra Pro accommodating.
2 creators8 opinions
Opinions (8)
Humble Running finds that the Cloudultra Pro has one of the nicer volume and toe box shapes among trail super shoes, and he often recommends it for those wanting a shoe that is not too aggressive in terms of ride.
On Cloudboom Strike 2 Review // Why Trail Supershoes Play by Different Rules3:54Humble Running finds that the Cloudultra Pro's toe box is spacious, squared off at the front, and maintains width, so small toes will not rub and there is space on the big toe side.
On Cloudboom Strike 2 Review // Why Trail Supershoes Play by Different Rules3:54Humble Running states that the Cloudultra Pro has one of the best, most spacious, and comfortable toe boxes of any trail super shoe on the market.
On Cloudboom Strike 2 Review // Why Trail Supershoes Play by Different Rules3:54
3Several reviewers characterize the Cloudultra Pro not as an aggressive, race-only super shoe but as a versatile all-arounder that rides smoothly and feels more like an enhanced daily trainer.
The Cloudultra Pro suits buyers who want super-shoe technology in a shoe tame enough for everyday training miles and long ultras alike, rather than a sharp, aggressive racer.
2 creators6 opinions
Opinions (6)
Humble Running observes that the Cloudultra Pro's ride is very smooth and feels more like a training shoe or all-around versatile shoe, not a crazy aggressive plated super shoe.
On Cloudboom Strike 2 Review // Why Trail Supershoes Play by Different Rules3:54Humble Running describes the Cloudultra Pro as one of the friendliest trail super shoes, with a soft cushion feel that is comfortable without the plate feeling intrusive or overly aggressive, comparable to an enhanced daily trainer.
On Cloudultra 3 vs Cloudultra Pro // Full Review & Comparison15:43Humble Running 's overall verdict: if choosing one shoe for long-distance ultras, pick the Cloudultra Pro; it is highly adaptable for training miles and can serve as both a trainer and racer.
On Cloudultra 3 vs Cloudultra Pro // Full Review & Comparison15:43
4Opinions differ on the Cloudultra Pro's stability, with some reviewers finding it stable and forgiving while others report instability on technical rock fields, steep downhills, or narrow midfoot sections.
The shoe's soft, tall stack and relatively narrow midfoot divide opinion; runners who are stable on moderate trails may love it, while those prone to ankle instability or running very technical terrain should test carefully.
4 creators10 opinions
Opinions (10)
Humble Running observes that the Cloudultra Pro requires more care on downhills due to its softness, and the runner must manage balance.
On Cloudultra 3 vs Cloudultra Pro // Full Review & Comparison3:58RoadTrailRun concludes that the On Cloudultra Pro provides a nice forgiving landing for long distances with a stabilizing element underneath.
Compared! Rocket X Trail, Cloudultra Pro, Cascadia Elite, Terrex Speed Ultra 2, Nike ACG Ultra Fly 29:12TF XC Running Shoe Reviews (TF XC) finds the On Cloudultra Pro was a little more unstable than he would have liked when going over technical rock fields.
On Cloudultra Pro First Impressions Review & ComparisonsWatch source
5Multiple reviewers observe that the Cloudultra Pro is heavier than competing trail super shoes, measured around 9.7–9.8 ounces in a US size 10.
Weight-conscious racers should note the Cloudultra Pro sits at the heavier end of the trail super-shoe spectrum, a trade-off for its higher stack and cushioning.
3 creators4 opinions
Opinions (4)
Humble Running measured the Cloudultra Pro at 9.8 oz and the Cloudultra 3 at 10.1 oz, noting the Pro has more stack height yet weighs less.
On Cloudultra 3 vs Cloudultra Pro // Full Review & Comparison11:33RoadTrailRun measured the On Cloudultra Pro at 9.7 ounces (about 276 grams), making it slightly heavier than the Hoka Rocket X Trail and Adidas Terrex Speed Ultra 2 (both 9 oz / 256 g).
Compared! Rocket X Trail, Cloudultra Pro, Cascadia Elite, Terrex Speed Ultra 2, Nike ACG Ultra Fly 2Watch sourceTF XC Running Shoe Reviews (TF XC) measured the weight at 9.7 oz for a men's size 10 (reviewer's measurement).
On Cloudultra Pro First Impressions Review & ComparisonsWatch source
6Several reviewers highlight the Cloudultra Pro's open, breathable leno-weave upper, noting it drains water well but can let in debris on sandy terrain.
The upper excels in hot, wet conditions and drains quickly, but runners on sandy or loose terrain may experience some debris ingress.
3 creators7 opinions
Opinions (7)
Humble Running observes that the Cloudultra Pro has a see-through upper material that is one of the lighter-weight uppers from On, feeling very solid and structured with a web of overlays.
On Cloudboom Strike 2 Review // Why Trail Supershoes Play by Different Rules31:07Humble Running states both uppers are Lenoweave, but the Pro upper is more open and breathable, while the Cloudultra 3 upper is tighter and less open.
On Cloudultra 3 vs Cloudultra Pro // Full Review & Comparison7:56Humble Running notes that the more open upper on the Cloudultra Pro lets debris in on sandy terrain, but this was not a bother during a race.
On Cloudultra 3 vs Cloudultra Pro // Full Review & Comparison7:56
7Reviewers consistently identify the Cloudultra Pro's plate as a nylon-fiberglass Speedboard rather than a carbon-fiber plate, and several find it more flexible and less intrusive than carbon plates in other super shoes.
Buyers wary of stiff carbon plates may appreciate the Cloudultra Pro's more forgiving, flexible plate, which contributes to its smooth, trainer-like ride.
2 creators6 opinions
Opinions (6)
Humble Running observes that the Cloudultra Pro has a full-length nylon fiberglass plate.
On Cloudboom Strike 2 Review // Why Trail Supershoes Play by Different Rules3:54Humble Running finds that the Cloudultra Pro's nylon fiberglass plate leads into a smoothness of efficiency, versus the loading-and-exploding feel of the Cloudboom Strike 2.
On Cloudboom Strike 2 Review // Why Trail Supershoes Play by Different Rules34:40Humble Running notes both the Cloudultra Pro and Cloudultra 3 contain a nylon-fiberglass speed board (plate) that is not felt underfoot, unlike some of On's previous speed boards.
On Cloudultra 3 vs Cloudultra Pro // Full Review & Comparison3:58
8Multiple reviewers recommend the Cloudultra Pro specifically for long-distance ultras, with one choosing it over competitors for a 100K race and another calling it the top pick if selecting a single shoe for ultra distances.
The Cloudultra Pro is well-regarded as a long-distance ultra shoe, though one reviewer speculates it may be outperformed by the Norda 055 beyond 150 km.
2 creators3 opinions1 counterpoint
Opinions (3)
Humble Running states that for a 100k race they chose the On Cloudultra Pro over the norda 005, because they felt the 005's protection (especially under the forefoot) was questionable for that distance.
norda 005 vs NNormal Kjerag 02 // Full Comparison & Wet Test34:16Humble Running 's overall verdict: if choosing one shoe for long-distance ultras, pick the Cloudultra Pro; it is highly adaptable for training miles and can serve as both a trainer and racer.
On Cloudultra 3 vs Cloudultra Pro // Full Review & Comparison15:43Meta Endurance compares the Norda 055 to the On Cloudultra Pro, stating that shoes like the Cloudultra Pro are 'a touch more responsive' and likely better suited for runs of 100 to 150 km.
norda 055 Review | More Stack, Better Upper, Worth It?7:07
9Several reviewers find the Cloudultra Pro fits true to size with a comfortable lockdown, though some recommend sizing up a half size for ultra distances to accommodate foot swelling.
Most runners can stick with their normal size for shorter efforts, but ultra runners may benefit from a half-size up for swelling on very long days.
2 creators8 opinions
Opinions (8)
Humble Running tested the On Cloudultra Pro in US size 10 and the Cloudultra 3 in US 9.5, noting the size 10 is noticeably roomier and also appears to have a slightly wider fit.
On Cloudultra 3 vs Cloudultra Pro // Full Review & Comparison0:08Humble Running recommends true-to-size sizing for the Cloudultra Pro for shorter, faster distances, rather than the half-size-up used for ultra distances.
On Cloudultra 3 vs Cloudultra Pro // Full Review & Comparison15:43TF XC Running Shoe Reviews (TF XC) tried the On Cloudultra Pro in his usual men's size 12 and found the fit was great, true to size, and one of the best fitting shoes he has ever had from On.
On Cloudultra Pro First Impressions Review & ComparisonsWatch source
10Multiple reviewers praise the Cloudultra Pro's tongue and lacing system, calling it among the best in its class for hold, comfort, and ease of use.
The gusseted, lightly padded tongue and effective lacing contribute to a secure, comfortable fit — a practical plus for long trail days.
3 creators6 opinions
Opinions (6)
RoadTrailRun really likes the tongue and lacing of the On Cloudultra Pro, stating the crinkle or serrated edges work really well and it's easy to lace up.
Compared! Rocket X Trail, Cloudultra Pro, Cascadia Elite, Terrex Speed Ultra 2, Nike ACG Ultra Fly 29:12RoadTrailRun observes that the On Cloudultra Pro has a thin tongue with padding, similar to the Brooks Cascadia Elite.
Compared! Rocket X Trail, Cloudultra Pro, Cascadia Elite, Terrex Speed Ultra 2, Nike ACG Ultra Fly 29:12RoadTrailRun observes that the On Cloudultra Pro has a full gusset made of a very soft fabric, providing very good hold and very good stability.
Compared! Rocket X Trail, Cloudultra Pro, Cascadia Elite, Terrex Speed Ultra 2, Nike ACG Ultra Fly 29:12
11Reviewers describe the Cloudultra Pro's midfoot as relatively narrow, which some see as a benefit for agility and others as a concern for stability or specific foot conditions.
The narrow midfoot may appeal to runners valuing agility but could be a concern for those with stability issues or wider midfoot needs; trying before buying is advisable.
2 creators4 opinions
Opinions (4)
RoadTrailRun measured the platform widths of the On Cloudultra Pro: 90 mm at the heel, 70 mm at the midfoot, and 110 mm at the forefoot.
Compared! Rocket X Trail, Cloudultra Pro, Cascadia Elite, Terrex Speed Ultra 2, Nike ACG Ultra Fly 218:37RoadTrailRun considers the On Cloudultra Pro's narrower midfoot (70 mm) translates to better agility, whereas the Brooks and Hoka are more stable on the ground.
Compared! Rocket X Trail, Cloudultra Pro, Cascadia Elite, Terrex Speed Ultra 2, Nike ACG Ultra Fly 218:37Doctors of Running was nervous about how narrow the Cloud Ultra's midfoot is, given their tibialis posterior tendinopathy symptoms.
Adidas Prime X2 vs. X3, Shoes for Tendon Pain, Mount to Coast P1 after 100 Miles | 3-in-114:42
12One reviewer notes the Cloudultra Pro's dual-layer foam uses a softer Helion HF top layer over a firmer Helion HF bottom layer, a construction multiple reviewers confirm and connect to the shoe's soft-yet-stable character.
The dual-density foam stack is central to the Cloudultra Pro's identity — soft on top for comfort, firmer below for platform stability — and is a key differentiator from the regular Cloudultra 3.
3 creators6 opinions
Opinions (6)
Humble Running states that the Cloudultra Pro has a dual-layer setup: a softer Helion HF top layer and a firmer Helion HF bottom layer.
On Cloudboom Strike 2 Review // Why Trail Supershoes Play by Different Rules0:07Humble Running states both shoes use Helion HF (hyper foam) foam, and after break-in or possibly because of warmer conditions, the foams feel similar, though the 6 mm stack difference contributes to the softness feel.
On Cloudultra 3 vs Cloudultra Pro // Full Review & Comparison3:58RoadTrailRun observes that the top foam layer of the On Cloudultra Pro is Helion HF supercritical foam, which he describes as relatively soft with a lot of energy.
Compared! Rocket X Trail, Cloudultra Pro, Cascadia Elite, Terrex Speed Ultra 2, Nike ACG Ultra Fly 2
13One reviewer reports that after a 108 km race plus additional test miles, the Cloudultra Pro retained its energetic feel and molded better to the foot without degradation.
Durability over ultra distances appears strong based on one reviewer's extended testing, suggesting the foam and plate hold up well over long mileage.
1 creator1 opinion
Opinions (1)
14One reviewer identifies the Cloudultra Pro's strobel-less design — a fabric attachment ring with no strobel board under the center of the foot — as contributing to a more direct, soft underfoot feel.
The absence of a central strobel board is a construction detail that may explain part of the shoe's distinctive soft, direct ground feel.
1 creator1 opinion
Opinions (1)
