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 front and sleeves.Nano Flex Light Woven on back for extra stretchy breathability with good water protection.YKK® Vislon® top and bottom zippers for easy on-the-go ventilation adjustments.3 Reflective panel at the bottom of the pockets.Colours: 085 light black, 294 clay grey, 654 mineral red, 857 orange, 363 green tea, 414 dark blue, 883 melonSizes: XS - XLWeight: 164g. (M)Temperature range: 10 - 18 ˚C Material composition:Hlavnuter outer material 100% polyester Main inner material 92%polyester 8%elastaneBack under sleeve, sides, back 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. 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 hard to define exactly. In a sense, it's a warmer vest because it has the same construction as the Perfetto RoS 2 vest, but with short 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 adjustments. 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.