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Smartwool Merino 150 Base Layer Top vs Smartwool Merino 250 Crew

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

Smartwool Merino 150 Base Layer Top is the lighter option — 107 g lighter than the Smartwool Merino 250 Crew (40% less weight). If grams matter to you, that is the one to beat.
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Spec Smartwool Merino 150 Base Layer Top Smartwool Merino 250 Crew
Weight 163 g · 0.163 kg · 0.36 lb 270 g · 0.270 kg · 0.60 lb
Brand Smartwool Smartwool
Category Clothing - Base Layer Clothing - Base Layer
Smartwool Merino 150 Base Layer Top
163 g

Lightweight merino wool base layer with excellent moisture management.

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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 Top vs Smartwool Merino 250 Crew: which should you buy?

If saving weight is your priority, the Smartwool Merino 150 Base Layer Top wins — at 163 g it is 107 g (40%) 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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