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REI Co-op Merino Wool Base Layer Crew vs Smartwool Merino 150 Base Layer Top

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

Smartwool Merino 150 Base Layer Top is the lighter option — 27 g lighter than the REI Co-op Merino Wool Base Layer Crew (14% less weight). If grams matter to you, that is the one to beat.
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Spec REI Co-op Merino Wool Base Layer Crew Smartwool Merino 150 Base Layer Top
Weight 190 g · 0.190 kg · 0.42 lb 163 g · 0.163 kg · 0.36 lb
Brand REI Co-op Smartwool
Category Clothing - Base Layer Clothing - Base Layer
REI Co-op Merino Wool Base Layer Crew
190 g

Budget-friendly merino wool base layer for backpacking.

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Smartwool Merino 150 Base Layer Top
163 g

Lightweight merino wool base layer with excellent moisture management.

Full details →

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REI Co-op Merino Wool Base Layer Crew vs Smartwool Merino 150 Base Layer Top: which should you buy?

If saving weight is your priority, the Smartwool Merino 150 Base Layer Top wins — at 163 g it is 27 g (14%) lighter than the REI Co-op Merino Wool Base Layer Crew (190 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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