What you should know: When it's warm or you're working hard on a hike, much of the time all you need is this insulating layer over your base. It needs to be lightweight and able to move with you.
Credit: Photograph by Greg Broom
Powered By ZergNet
The Brutal Charm of an NFL Hit Man
Plus: Jesse Ventura vs. the Navy Seals
ON NEWSSTANDS NOW
When to Say No to Your Doctor
Sign up to receive the Men’s Journal newsletter and special offers from MJ and its marketing partners.