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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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#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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- How we assessed it
- Specification researched

#3 on this list
200 Oasis
Icebreaker
The benchmark 200-weight Merino — the layer you can wear for a week and still be tolerable.
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- How we assessed it
- Specification researched
Specs side by side
| Spec | Expedition 235 | 200 Oasis |
|---|---|---|
| Material | 2-layer Merino (inner 100% merino, outer 90% merino/10% polyamide) | 100% Merino Wool |
| Weight | 235 g/m² (total fabric density) | — |
| Seams | Flatlock | Flatlock |
| Intended Use | Cold weather, low-moderate activity | — |
| Origin | Norway | — |
| Fabric Weight | — | 200 g/m² (Midweight) |
| Fit | — | Slim, Body-Hugging |
| Odor Resistance | — | Excellent |
| Care | — | Machine Wash Cold, Hang Dry |
What our reviewers liked and didn't
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
200 Oasis
- Exceptional odor resistance for multi-day use
- Excellent warmth-to-weight ratio for midweight class
- Soft, non-itchy feel against the skin
- Effective temperature regulation across activity levels
- Sustainable and ethically sourced merino wool
- Higher price point than many synthetics
- Requires careful washing and drying to maintain longevity
- Can be prone to snags or small holes with rough treatment
- Dries slower than pure synthetic options
Prices change constantly — the figure shown is the last verified catalog price, and the buy buttons always go to the current listing.


