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Altra Olympus 5 vs On Running Cloudultra 2
Weight and specs compared for 2026 — and which one to choose.
On Running Cloudultra 2 is the lighter option — 30 g lighter than the Altra Olympus 5 (5% less weight). If grams matter to you, that is the one to beat.
On Running Cloudultra 2
620 g
Ultra trail shoe with CloudTec cushioning for long distances.
Full details →Altra Olympus 5 vs On Running Cloudultra 2: which should you buy?
If saving weight is your priority, the On Running Cloudultra 2 wins — at 620 g it is 30 g (5%) lighter than the Altra Olympus 5 (650 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.
See where both rank against everything else in this category on the lightest footwear page, or browse the full gear weight database.