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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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#9 on this list
Kancamagus Midweight
Minus33
New Hampshire Merino at half the price of the imports, with the same 18.5-micron feel.
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- Reader rating
- No reader votes yet
- How we assessed it
- Specification researched

#10 on this list
Vapor Grid Crew
Duckworth
Montana wool grid, US-milled end to end. The best hybrid layer for high-output winter days.
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- Reader rating
- No reader votes yet
- How we assessed it
- Specification researched
Specs side by side
| Spec | Kancamagus Midweight | Vapor Grid Crew |
|---|---|---|
| Material | 100% Merino Wool | Merino Wool Blend |
| Weight | Midweight (230 GSM) | — |
| Seams | Flatlock | — |
| Origin | Designed in USA | Made in USA |
| Micron Count | 18.5 | — |
| Fabric Weight | — | Light-Midweight |
| Best For | — | High-Output Winter Activities |
| Fit | — | Athletic |
What our reviewers liked and didn't
Kancamagus Midweight
- Excellent warmth-to-weight ratio for a midweight merino
- Superior odor resistance, ideal for multi-day trips
- Soft 18.5-micron merino wool for next-to-skin comfort
- Breathable and effective at moisture management
- Exceptional value compared to premium merino brands
- Dries slower than synthetic alternatives
- Durability, while good for merino, isn't as high as some synthetics
- Limited color and style options
Vapor Grid Crew
- Excellent warmth-to-weight ratio for active use
- Superior breathability and moisture management
- Comfortable next-to-skin feel
- Naturally odor resistant
- Enhanced durability due to merino-synthetic blend
- Proudly made in the USA with Montana wool
- Higher price point than many synthetic alternatives
- Not the absolute warmest for static, extreme cold
- Slightly heavier and bulkier than ultralight options
Prices change constantly — the figure shown is the last verified catalog price, and the buy buttons always go to the current listing.


