Icebreaker 150 Zone Long Sleeve vs REI Co-op Merino Wool Base Layer Crew

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

Icebreaker 150 Zone Long Sleeve is the lighter option — 40 g lighter than the REI Co-op Merino Wool Base Layer Crew (21% less weight). If grams matter to you, that is the one to beat.

Spec	Icebreaker 150 Zone Long Sleeve	REI Co-op Merino Wool Base Layer Crew
Weight	150 g · 0.150 kg · 0.33 lb	190 g · 0.190 kg · 0.42 lb
Brand	Icebreaker	REI Co-op
Category	Clothing - Base Layer	Clothing - Base Layer

Icebreaker 150 Zone Long Sleeve

150 g

Ultralight merino base layer for high-output activities.

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REI Co-op Merino Wool Base Layer Crew

190 g

Budget-friendly merino wool base layer for backpacking.

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Icebreaker 150 Zone Long Sleeve vs REI Co-op Merino Wool Base Layer Crew: which should you buy?

If saving weight is your priority, the Icebreaker 150 Zone Long Sleeve wins — at 150 g it is 40 g (21%) 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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