By Michael Lanza
What’s your body type when you’re hiking, backpacking, or otherwise active outdoors? Do you run hot or cold—or both? Over many years of dayhiking, backpacking, climbing, trail running, cycling, skiing in its various forms, and other activities, I’ve discovered this about myself: I run very warm when I’m moving, but I cool off in a flash when I stop. To some degree, many people are like that. And those that aren’t—who just plain run consistently hot or cold—still have to tackle the same question I do: How do you pick the best base layer top for you?