On Running Cloudultra 3 vs On Running Cloudultra Pro
Weight and specs compared for 2026 — and which one to choose.
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Same kind of shoe, so weight is a fair tiebreaker.
Both are trail running shoes. The On Running Cloudultra Pro is 40 g a pair lighter than the On Running Cloudultra 3.
What the extra 40 g of the On Running Cloudultra 3 buys you
- A lower list price at Alpinetrek: £179.95 against £249.95.
What the On Running Cloudultra Pro offers besides the lower weight
- More cushioning under the heel (39 mm stack against 32 mm).
Weights are per pair as Alpinetrek lists them, usually for a medium size, so a few grams either way can come from the size they weighed. The other specs were checked on 19 October 2026 against Alpinetrek (On Running Cloudultra 3) and Alpinetrek (On Running Cloudultra Pro). "Not stated" means the source does not mention it, not that the shoe lacks it. List prices are the full price shown by that source, not a sale price; where sources disagree we show none.
Choose the On Running Cloudultra 3 if…
…you move fast on trails, run some of it, and want the lightest and most flexible shoe; it gives little ankle support under a heavy pack.
Choose the On Running Cloudultra Pro if…
…you move fast on trails, run some of it, and want the lightest and most flexible shoe; it gives little ankle support under a heavy pack.
Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.
See where both rank against everything else in this category on the lightest footwear page, or browse the full gear weight database.