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. Features Polyester content made from recycled polyester Long half-length zipper makes it easier to put on and allows rapid ventilation in warm temperatures Bonded chest pocket with zipper Flatlock seams Suitable forSki Touring, Trail Running, Mountaineering, Hiking Item number1014-05521 CutAthletic Fit Weight181 g Materials Insert83% Polyamide, 17% Spandex Insert 2100% Polyester (recycled) Main material90% Polyester (recycled), 1% Polyester, 9% Spandex