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Kahtoola NANOspikes vs On Running Cloudultra 2

Weight and specs compared for 2026 — and which one to choose.

Kahtoola NANOspikes is the lighter option — 336 g lighter than the On Running Cloudultra 2 (54% less weight). If grams matter to you, that is the one to beat.
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Spec Kahtoola NANOspikes On Running Cloudultra 2
Weight 284 g · 0.284 kg · 0.63 lb 620 g · 0.620 kg · 1.37 lb
Brand Kahtoola On Running
Category Footwear Footwear
Kahtoola NANOspikes
284 g

Lightweight traction device for light snow and ice.

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On Running Cloudultra 2
620 g

Ultra trail shoe with CloudTec cushioning for long distances.

Full details →

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Kahtoola NANOspikes vs On Running Cloudultra 2: which should you buy?

If saving weight is your priority, the Kahtoola NANOspikes wins — at 284 g it is 336 g (54%) lighter than the On Running Cloudultra 2 (620 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.

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