Mammut Aenergy Beanie

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Lightweight, helmet-compatible, and sustainably crafted, the Mammut Aenergy Beanie is a top-choice companion for cold-weather endurance pursuits.

Mammut says: 

The cap for alpine endurance sports: With its ECONYL® recycled nylon stretch material, this functional cap is warm and moisture-regulating and also has a small carbon footprint. Extra comfort is ensured thanks to the soft brushed fleece inside and the close-fitting cut. This makes the Aenergy Beanie comfortable to wear under a ski or climbing helmet.

All Mammut products purchased within the Europe come with an extended 30-month warranty period. For more details click here.

Our Verdict

The Mammut Aenergy Beanie is a lightweight, functional layer for endurance activities in cold conditions. Made from ECONYL® recycled nylon, it’s eco-friendly and highly effective at balancing warmth and moisture management. This beanie is easy to pack with its slim profile, weighing just 28g in the small/medium size. The soft brushed fleece interior makes it comfortable to wear under a helmet.

Its stretch material offers a snug, close-fitting cut that stays in place during intense activities. The Aenergy Beanie’s blend of warmth, moisture regulation, and sustainable materials makes it a solid choice for winter hiking.

– Reviewed by Ultralight Outdoor Gear

Features

• Helmet-compatible, lightweight functional beanie
• Warm stretch material with excellent moisture management makes the garment comfortable

Specifications

• Small/Medium Weighs: 28g
• Medium/Large Weighs: 30g

Material & Construction

• Main Fabric 2 (B2B): econyl brushed knit fabric
• Main Fabric 1 (B2B): econyl brushed knit fabric
• Main Fabric 1 – Face Material (B2B): 84% Polyamide (ECONYL® Regenerated Nylon), 16% Spandex