Icebreaker Merino 200 Oasis LS Crew vs Smartwool Merino 250 Crew

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

Icebreaker Merino 200 Oasis LS Crew is the lighter option — 50 g lighter than the Smartwool Merino 250 Crew (19% less weight). If grams matter to you, that is the one to beat.

Spec	Icebreaker Merino 200 Oasis LS Crew	Smartwool Merino 250 Crew
Weight	220 g · 0.220 kg · 0.49 lb	270 g · 0.270 kg · 0.60 lb
Brand	Icebreaker	Smartwool
Category	Clothing - Base Layer	Clothing - Base Layer

Icebreaker Merino 200 Oasis LS Crew

220 g

100% merino wool long sleeve base layer with 200g/m² fabric weight. Flatlock seams, underarm gusset, and offset shoulder seams. Men's medium.

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Smartwool Merino 250 Crew

270 g

Midweight merino base layer for cold-weather hiking.

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Icebreaker Merino 200 Oasis LS Crew vs Smartwool Merino 250 Crew: which should you buy?

If saving weight is your priority, the Icebreaker Merino 200 Oasis LS Crew wins — at 220 g it is 50 g (19%) lighter than the Smartwool Merino 250 Crew (270 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 clothing - base layer page, or browse the full gear weight database.

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