Layer up to stay dry and warm, even at the summit. The women's slim-fitting Burton [ak] Helium Power Grid Base Layer Crewneck works to do just that, with Polartec Power Grid fabric that's both highly breathable and quick-drying for all that backcountry pow. Softlock seams and four-way stretch fabric work to give you all the flex your descent will need.   FEATURES: Slim fit sits close to the body, with room for the garment to move with you. Polartec Power Grid fabric increases warmth and breathability in a lightweight and durable design that reduces mass and maximizes performance. Grid pattern offers ultimate breathability with superior moisture wicking. Chafe-free softlock seams for added comfort.