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 VerdictThe Mammut Aenergy Beanie is a lightweight, functional layer for endurance activities in cold conditions. Made from ECONYL recycled nylon, its 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 Beanies blend of warmth, moisture regulation, and sustainable materials makes it a solid choice for winter hiking. – Reviewed by Ultralight Outdoor GearFeaturesHelmet-compatible, lightweight functional beanieWarm stretch material with excellent moisture management makes the garment comfortableSpecificationsSmall/Medium Weighs: 28gMedium/Large Weighs: 30gMaterial & ConstructionMain Fabric 2 (B2B): econyl brushed knit fabricMain Fabric 1 (B2B): econyl brushed knit fabricMain Fabric 1 – Face Material (B2B): 84% Polyamide (ECONYL Regenerated Nylon), 16% Spandex

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&re