Altra Lone Peak 9 (Men's) vs On Running Cloudultra 3
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 3 is 65 g a pair lighter than the Altra Lone Peak 9 (Men's).
What the extra 65 g of the Altra Lone Peak 9 (Men's) buys you
- A lower list price at Alpinetrek: £129.95 against £179.95.
What the On Running Cloudultra 3 offers besides the lower weight
- More cushioning under the heel (32 mm stack against 25 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 (Altra Lone Peak 9 (Men's)) and Alpinetrek (On Running Cloudultra 3). "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 Altra Lone Peak 9 (Men's) 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 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.
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.