Stretchy and breathable with a regular fit Layer up for a cold day on the mountain. Stay warm at base camp. The women's Burton [ak] Helium Stretch Insulated Pants are that extra layer that makes all the difference to staying warm on the coldest days. Stretchy and breathable, they're made for wearing under your three-layer shell pants or bibs, and they're so comfy you'll prob wear them for a lot more things, too. Features: The seamless, contoured waist is inspired by the comfy stretch fit of yoga pants. Low-bulk insulation adds warmth while staying breathable when you're working hard. Stretch fabric lets you move easily without feeling restrictive. Soft, stretch cuffs let you adjust length to accommodate snowboard boots. Zippered hand-warmer pockets and a stash pocket add utility and keep choice items close. Bluesign® approved materials reduce impact on humans and the planet during manufacturing.