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, its 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 VerdictPolartec Power Grid fleece strikes a good balance between warmth and airflow, especially when youre working hard. The long half-zip vents heat quickly, and Ive found the fit to be trim without feeling restrictive. Its 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 GearFeaturesPolyester content made from recycled polyesterLong half-length zipper makes it easier to put on and allows rapid ventilation in warm temperaturesBonded chest pocket with zipperFlatlock seamsSpecificationsSmall weighs: 182gMedium weighs: 189gLarge weighs: 211gXLarge weighs: 217gCut: Athletic FitMaterial & ConstructionMain Fabric 1: Polartec Power Grid Fleece (125 g/m)Main Fabric 2 : light weight double weave

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