Mammut

Aenergy IN Hooded Jacket - Men's

What Our Gearhead® Experts Are Saying:

"This jacket is impressively warm for how lightweight it is. The responsibly sourced hydrophobic down keeps me insulated even in damp conditions, and the ultralight recycled nylon shell allows it to pack down small in my pack. I love the climbing-harness-compatible pockets and the snug-fitting hood—perfect for technical mountain missions or just staying warm on the go."

Fast, light, and warm—the Mammut Aenergy IN Hooded Jacket is designed for mountain athletes who demand peak performance from their gear. As Mammut’s lightest insulated jacket, it delivers powerful warmth without unnecessary bulk, thanks to its responsibly sourced, water-resistant down insulation. The down expands fully beneath an ultralight recycled nylon shell, providing optimal heat retention while remaining highly packable.

Built for technical pursuits, this jacket features pre-shaped sleeves for mobility, harness-compatible zippered pockets, and an elastic-bound hood for extra coverage. When not in use, it stows into its own pocket, making it an easy-to-carry backup for unpredictable alpine conditions. Whether layering under a shell or wearing it solo, the Aenergy IN Hooded Jacket is the go-to choice for those who move fast in the mountains.