The Rule: Breathability is Number One.
The baselayer is the only constant of your system—the idea is to leave it on and change your other layers to meet conditions. Polar explorer Eric Larsen prefers a technical T-shirt for core warmth and maximum venting. Baselayers preserve a layer of air next to the skin to prevent chills.
Pick the Right Baselayer
How to Keep Your Baselayer Dry
Moderate your pace
Find the sweet spot that lets you produce enough heat to dry your shirt without letting your sweat chill you.
Sleep with it
If you only brought one baselayer and it’s damp (not soaked), put midlayers on over it and hop in your sleeping bag. Your body heat will bake it dry overnight.
Hang it
If it’s warm and windy, hang your baselayer over a branch, bush, or rock. Most tech shirts dry quickly.
Freeze dry
If it’s cold and very dry, hang your shirt outside to freeze the moisture…
