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.

• Regular fit is just right: Not too tight or too baggy

• Stretchy, breathable, and lightweight nylon plain weave fabric

• Breathable with light wind resistance for medium-intensity activities where breathability is a higher priority than wind resistance and added layering helps provide warmth

• Thermacore stretch insulation [40g] for focused warmth and enhanced breathability; [ak] DWR coating

• Lightweight low-profile back of hem cinch; Pocket utility loop and media port; Reflective details

• Packable into a pocket

• Zippered chest pocket and hand-warmer pockets

• bluesign® approved materials use only safe chemicals and reduce impact on both humans and the planet during manufacturing