Take a hike (to the summit) and don’t look back until you have to look down. The men’s Burton [ak] Helium Power Grid™ Base Layer Crewneck Top is made with sweat-wicking fabric to help you stay cool while you work. Polartec® Power Grid™ fleece keeps it super light and breathable, and keeps out the cold like you need it to. A close-to-skin fit means you get the flex you want on the hill. FeaturesSlim fit sits close to the body, with room for the garment to move with youPolartec® Power Grid™ fabric increases warmth and breathability in a lightweight and durable design that reduces mass and maximizes performanceGrid pattern offers ultimate breathability with superior moisture wickingChafe-free softlock seams for added comfortbluesign® approved materials use only safe chemicals and reduce impact on both humans and the planet during manufacturing