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Compare Best Long Underwear head to head
Pick any two picks from this list and see specs, current price, pros, cons and reader ratings side by side.
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#1 on this list
WarmWool Crew and Pants
Aclima
Norwegian 400 gsm double-face wool. The warmest true base layer sold, and it dries fast for the weight.
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- How we assessed it
- Specification researched
#2 on this list
Expedition 235
Devold
Norwegian Merino with flatlock seams that vanish under a hipbelt. The all-day winter set.
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- Specification researched
Specs side by side
| Spec | WarmWool Crew and Pants | Expedition 235 |
|---|---|---|
| Material | 100% Merino Wool | 2-layer Merino (inner 100% merino, outer 90% merino/10% polyamide) |
| Fabric Weight | 400 gsm | — |
| Knit Type | Double-Face | — |
| Origin | Norway | Norway |
| Temperature Range | Extreme Cold | — |
| Fit | Athletic, next-to-skin | — |
| Weight | — | 235 g/m² (total fabric density) |
| Seams | — | Flatlock |
| Intended Use | — | Cold weather, low-moderate activity |
What our reviewers liked and didn't
WarmWool Crew and Pants
- Exceptional warmth-to-weight ratio for extreme cold
- Insulates effectively even when damp
- Highly durable 400 gsm double-face merino knit
- Excellent moisture management and odor resistance
- Comfortable next-to-skin feel despite the thickness
- Higher price point than most base layers
- Bulkier and heavier than typical merino options
- Too warm for mild winter or high-output activities above freezing
Expedition 235
- Exceptional warmth in cold to very cold conditions
- Effective two-layer construction for comfort and durability
- Excellent moisture management without feeling clammy
- Flatlock seams prevent chafing under packs and layers
- High quality, robust construction for long-term use
- Bulkier and heavier than lighter base layers
- Can be overkill for mild winter days or high-output activities
- Higher price point reflecting premium materials and construction
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