WHAT IT IS / PRODUCT FEATURES With the base layer, this is a jersey with wind protection for mild conditions. You can also use it over the jersey as a vest with extra protection on the shoulders. Lightweight, breathable wind protection at the front with all-over water repellency. CASTELLI's lightest short-sleeve wind protectionGORE-TEX INFINIUM™ WINDSTOPPER® 203 Stretch - lightweight stretch fabric at the front and sleeves.Nano Flex Light Woven at the back for extra stretch breathability with good water protection.YKK® Vislon® two-way zipper for easy ventilation adjustments along the way.3. Colors: 064 nickel grey, 085 light black, 383 vibrant lime, 424 Belgian blue,857 red-orange Sizes: XS - 3XLWeight: 182g. (L)Temperature range: 10 - 18 ˚C Material composition_Outer material 100% polyesterMain inner material 92%polyester 8%elastaneBack piece, back piece under sleeve, pocket, sides 78%polyester 22%elastaneInner collar 90%polyester 10%elastane The Perfetto RoS 2 WIND jersey was born out of a requirement from our professional riders: I want to wear the Gabba jersey all the time, but sometimes it's too hot. With the fourth generation, we're also changing the name of the Perfetto Light jersey to Perfetto RoS 2 Wind. It has become an essential part of our autumn and spring wardrobes, as it is very useful in many situations... and therefore very difficult to define precisely. In one sense, it's a warmer vest because it has the same construction as the Perfetto RoS 2 vest, but with shorter sleeves. In another sense, it's a less warm Gabba. However YOU define it, you'll appreciate that it offers just the right amount of cold-weather protection while retaining a high level of breathability. In mild weather, use it as a jersey over a lightweight base layer with Seamless arm warmers. The "2" part of the name refers to updates from the latest version, including a two-way YKK® Vislon® zipper for improved ventilation. Reflective elements on the back are more visible, the trio of pockets can hold more gear and the elongated back panel has been shrunk to make it easier to store.