Mammut Aenergy Light ML Half Zip Pull-On

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A minimalist midlayer built for all-season movement, with just enough warmth and plenty of breathability.

Mammut says: 

For unbeatable performance and versatility, our Aenergy Light styles solve for a full range of seasons and pursuits. Combining the right touch of warmth with exceptional wicking and breathability, this ultra-light midlayer doubles as a warm base layer to see you through winter ski tours and summer hikes alike. With a deep half zip for optimal ventilation and a laminated pocket to stash essentials, it’s the perfect choice for all who seek maximum performance at minimal weight.

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

Our Verdict

Polartec Power Grid fleece strikes a good balance between warmth and airflow, especially when you’re working hard. The long half-zip vents heat quickly, and I’ve found the fit to be trim without feeling restrictive. It’s smooth enough for next-to-skin wear, and the flat seams prevent chafing under a harness or pack. The bonded chest pocket is slim but functional, and the fabric dries quickly if you sweat through it. It would be ideal for spring ascents and fastpacking.

– Reviewed by Ultralight Outdoor Gear

Features