Lightweight and insulated, this packable layer is built to breathe and stretch, so you can get after it in the mountains.
Shed layers for the climb. Add layers for the descent. The men's Burton [ak] Helium Stretch Vest is a lightweight layer that can do it all. It breathes while you're headed uphill and offers needed insulation under your shell on the descent. When the sun shines and the temps rise, it packs into its own pocket for easy stowing.