A well-fitting base layer with an impressively large zip that ventilates heat quickly when you need it to. Mammut says:Our lightest and most technical first layer is a true multi-sport MVP. Airy and breathable with offset merrow stitching, its barely-there feel is enhanced by body-mapped mesh and natural sweat-wicking properties for optimal temperature regulation. Quick-drying and odor inhibiting to keep up with your sweatiest challenges, its reflective detailing keeps you visible when the sun gives in before you do. The half-zip variation of our staple high-performance longsleeve is an easy choice for every outdoor enthusiast. All Mammut products purchased within the Europe come with an extended 30-month warranty period. For more details click here.Our VerdictI’m always a fan of a long-sleeved base layer, you can roll up the sleeves in warm weather, and if the sun is very hot, you can roll the sleeves down to protect yourself from the sun;thats why I always look for long sleeve base layers preferably with a zip, to regulate heat even when you are exerting yourself quickly. The Aenergy Longsleeve has a huge half-length zip, something I really appreciate on hot days. This first layer fits well, I’m a medium in most clothing, and I dont see any need to go up or down in sizing. The Polyester knit feels soft against your skin, and the odour control works well. A good base layer that ticks all the boxes for me – Reviewed by Ultralight Outdoor GearFeatures100% recycled polyesterMesh ventilation zones on back and under armsOffset, smooth merrow-stitch seamsLong half-length zipper makes it easier to put on and allows rapid ventilation in warm temperaturesTreated with HeiQ Fresh FFL – a bio-based technology that reduces unpleasant odorsQuick-dryingReflective elementsSpecificationsSmall weighs: 119gMedium weighs: 129gLarge weighs: 137gXLarge weighs: 145gBack Length: 71 cm (Size Medium)Athletic FitMaterial & ConstructionPolyester knit with fresh ffl by heiqHelp & advice:The Ultimate Guide to Lightweight BaselayersRecycled Content in Outdoor GearWhat is Bluesign?

A well-fitting base layer with an impressively large zip that ventilates heat quickly when you need it to. Mammut says:Our lightest and most technical first layer is a true multi-sport MVP. Airy and breathable wi