2027 Burton AK Helium Insulated Pant Layer up for a cold day on the mountain. Stay warm at base camp. The men&';s Burton [ak] Helium Stretch Insulated Pants are that extra layer that makes a difference on the coldest days. Stretchy and breathable, they&';re made for wearing under your shell pants or bibs, but they&';re so comfortable you&';ll probably wear them for a lot more things, too. Summary Fit Regular Length Inseam 32.5" Inches Material Stretch Breathable Lightweight 20D Nylon/Spandex Plain Weave + DWR Waterproof Rating DWR Coated Breathability High-CFM Stretch Fabric Insulation 40g Thermacore Stretch Warranty Lifetime Warranty