Pack or skip
Thermal underwear for Seoul in January
Verdict
Pack it
Lows around 21°F — thermals are the difference between a walk and a march.
Why
Seoul in January averages highs of 36°F, lows of 21°F, 6 rainy days.
That climate means thermal underwear earns its space in the bag. Lows around 21°F — thermals are the difference between a walk and a march.