Smartwool Merino 150 Base Layer Long Sleeve vs Smartwool Merino 250 Crew

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

Smartwool Merino 150 Base Layer Long Sleeve is the lighter option — 120 g lighter than the Smartwool Merino 250 Crew (44% less weight). If grams matter to you, that is the one to beat.

Spec	Smartwool Merino 150 Base Layer Long Sleeve	Smartwool Merino 250 Crew
Weight	150 g · 0.150 kg · 0.33 lb	270 g · 0.270 kg · 0.60 lb
Brand	Smartwool	Smartwool
Category	Clothing - Base Layer	Clothing - Base Layer

Smartwool Merino 150 Base Layer Long Sleeve

150 g

Lightweight merino-blend long-sleeve base layer (men's) with natural odor resistance for all-season layering.

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Smartwool Merino 250 Crew

270 g

Midweight merino base layer for cold-weather hiking.

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Smartwool Merino 150 Base Layer Long Sleeve vs Smartwool Merino 250 Crew: which should you buy?

If saving weight is your priority, the Smartwool Merino 150 Base Layer Long Sleeve wins — at 150 g it is 120 g (44%) 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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