Darn Tough Micro Crew Lightweight vs On Running Cloudultra 2

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

Darn Tough Micro Crew Lightweight is the lighter option — 520 g lighter than the On Running Cloudultra 2 (84% less weight). If grams matter to you, that is the one to beat.

Spec	Darn Tough Micro Crew Lightweight	On Running Cloudultra 2
Weight	100 g · 0.100 kg · 0.22 lb	620 g · 0.620 kg · 1.37 lb
Brand	Darn Tough	On Running
Category	Footwear	Footwear

Darn Tough Micro Crew Lightweight

100 g

Lightweight merino wool socks for trail running. Per pair.

Full details →

On Running Cloudultra 2

620 g

Ultra trail shoe with CloudTec cushioning for long distances.

Full details →

Darn Tough Micro Crew Lightweight vs On Running Cloudultra 2: which should you buy?

If saving weight is your priority, the Darn Tough Micro Crew Lightweight wins — at 100 g it is 520 g (84%) 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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