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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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Expedition 235

#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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200 Oasis

#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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Specification researched

Specs side by side

Expedition 235 versus 200 Oasis specifications
SpecExpedition 235200 Oasis
Material2-layer Merino (inner 100% merino, outer 90% merino/10% polyamide)100% Merino Wool
Weight235 g/m² (total fabric density)
SeamsFlatlockFlatlock
Intended UseCold weather, low-moderate activity
OriginNorway
Fabric Weight200 g/m² (Midweight)
FitSlim, Body-Hugging
Odor ResistanceExcellent
CareMachine 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

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