WHAT IT IS / PRODUCT FEATURESMade to keep your torso warm while providing ample ventilation so you don't overheat. Brushed fleece inside for warmth. With stretch side panels for a perfect fit. Warmer fabric on body and sleeves.Elastic Warmer X-Stretch on side panels.Elastic waistband.3 back pockets.Easy-sliding YKK® Vislon® zipper with neck protection.Colors: 978 Terra (earth), 979 Fuoco (fire), 982 Cielo (sky)Sizes: XS - 3XLWeight: 244g. (M)Temperature range: 14 - 18 ˚C Material composition:Hlavnth material 100%polyesterSides 80%polyester 20%elastane This warm jersey is the first step to cold-weather dressing. Here, CASTELLI has set the standard for what clothing can do. We've taken the same approach. You'll wear the jersey on cold days, so we gave it a brushed fleece inner layer, keeping the fabric stretchy for a great fit. Since you'll be using it in conditions that aren't yet cold enough for a jacket, we designed the fabric to let a certain amount of air through so you don't overheat. We think a jersey like this should be purely functional, so it has three roomy back pockets, a silicone elastic waistband, and an easy-sliding YKK® Vislon® zipper.