Arc'teryx Rho LT Crew vs Icebreaker Merino 200 Oasis Long Sleeve Crew

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

Arc'teryx Rho LT Crew is the lighter option — 182 g lighter than the Icebreaker Merino 200 Oasis Long Sleeve Crew (54% less weight). If grams matter to you, that is the one to beat.

Spec	Arc'teryx Rho LT Crew	Icebreaker Merino 200 Oasis Long Sleeve Crew
Weight	155 g · 0.155 kg · 0.34 lb	337 g · 0.337 kg · 0.74 lb
Brand	Arc'teryx	Icebreaker
Category	Clothing - Base Layer	Clothing - Base Layer

Arc'teryx Rho LT Crew

155 g

Lightweight Phasic base layer for cool and active conditions.

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Icebreaker Merino 200 Oasis Long Sleeve Crew

337 g

Midweight 200gsm 100% merino wool base layer top with natural odor resistance and temperature regulation.

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Arc'teryx Rho LT Crew vs Icebreaker Merino 200 Oasis Long Sleeve Crew: which should you buy?

If saving weight is your priority, the Arc'teryx Rho LT Crew wins — at 155 g it is 182 g (54%) lighter than the Icebreaker Merino 200 Oasis Long Sleeve Crew (337 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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