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
The 2014 Adventure Issue
From Iceland's Highway 1 to Utah's Canyonlands, an epic itinerary for modern explorers.
Plus: Building a Bigger Action Hero
ON NEWSSTANDS NOW
The Interpreters We Left Behind
The Rise of Cyclocross
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