Best Long Underwear · #4
Classic Thermal Merino 250
Smartwool
#4
Classic Thermal Merino 250
Smartwool
Gear
Why it made the list
The best-cut 250-weight in the US, with a body-mapped fit that never rides up.
Where to buy the Classic Thermal Merino 250
We link straight to the manufacturer's own catalog for the exact make and model, plus Amazon where it's carried.
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Full profile in progress
We're building out complete profiles for every pick on every list — specs, materials, real-world use notes, and photography. This entry is next in the queue. In the meantime, the ranked note above is our short answer for why it made the list.