Altra Olympus 6 vs On Running Cloudultra Pro
Weight and specs compared for 2026 — and which one to choose.
Max-cushion zero-drop trail shoe with FootShape toe box and Vibram Megagrip outsole, built for long miles and heavy packs.
Full details →Ultralight trail running shoe at 9.2 oz per shoe, designed for fast hiking and trail running
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Altra Olympus 6 vs On Running Cloudultra Pro: which should you buy?
If saving weight is your priority, the On Running Cloudultra Pro wins — at 262 g it is 92 g (26%) lighter than the Altra Olympus 6 (354 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.