take a hike (to the summit) and don't look back until you have to look down. the men's burton [ak] helium power gridâ„¢ base layer crewneck top is made with sweat-wicking fabric to help you stay cool while you work. polartec® power gridâ„¢ 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 gridâ„¢ 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