Mammut

Aenergy Beanie

What Our Gearhead® Experts Are Saying:

"This is my go-to beanie for ski tours and ice climbing. It fits perfectly under my helmet and keeps me warm without overheating thanks to the brushed interior and breathable stretch. Plus, the recycled fabric gives it solid sustainability cred."

For fast-paced mountain missions or high-output winter training, we need headwear that can keep up—and the Aenergy Beanie from Mammut delivers. Built with recycled ECONYL nylon, it’s warm, light, and built for motion. Whether we’re skinning uphill or scrambling above treeline, it fits snugly under a helmet or hood without bunching or slipping.

Inside, a soft brushed fleece lining adds next-to-skin comfort while actively managing moisture, so we stay dry even when pushing the pace. Designed with input from athletes and alpine guides, it’s the kind of beanie we forget we’re wearing—until we realize how well it’s working.