WHAT IT IS / PRODUCT FEATURES With the base layer, this is a jersey with wind protection for mild conditions. Alternatively, use it over the jersey as a vest with added protection on the shoulders. Lightweight, breathable front wind protection with all-over water repellency. Lightest CASTELLI short-sleeve wind protectionGORE-TEX INFINIUM™ WINDSTOPPER® 203 Stretch - stretchy lightweight fabric on the front and sleeves.Nano Flex Light Woven on the back for extra stretchy breathability with good water protection.Two-way YKK® Vislon® zipper for easy on-the-go ventilation adjustments.3 Reflective panel at the bottom of the pockets.Colours: 064 nickel grey, 085 light black, 383 vibrant lime, 424 Belgian blue,857 red-orange, 642 Pompeii red, 048 grey Sizes: XS - 3XLWeight: 182g. (L)Temperature range: 10 - 18 ˚C Material composition:Hlavnuter 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 started life as a requirement of our professional riders: I want to wear the Gabba jersey all the time, but sometimes it gets too hot in it. So a slightly lighter and more breathable version of the Gabba is the Perfetto Light.With the fourth generation we are also changing the name from Perfetto Light to Perfetto RoS 2 Wind. It has become a staple in our fall and spring wardrobes because it is so useful in so many situations... and therefore very difficult to define precisely. In a 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 is a less warm Gabba. First and foremost, it's a jersey with front wind protection.Regardless of how YOU define it, you'll appreciate how it provides the right amount of protection on cold days while maintaining a high level of breathability. It makes you feel warm and protected, yet offers almost the same lightness and freedom of movement as a summer jersey.On mild days, use it as a jersey over a lightweight base layer with Seamless arm warmers. In cooler or variable conditions, wear it over a jersey with Seamless or Nano Flex hand warmers.The "2" part of the name refers to updates to the latest version, including a YKK® Vislon® two-way zipper for better 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 one piece more packable.