Castelli Aria Vest vest

Reinterpreted  the classic windproof vest to make it as streamlined as the rest of your wardrobe. This vest is designed to completely block the wind on the front while on the back it allows for great breathability. The fabrics are so incredibly lightweight that you'll be surprised how much warmer you'll be when you wear this vest over your shirt.
But the magic comes from the cut and the stretch fabric used on the back, which ensures that the vest sits close to the body without being too tight or making you look ridiculous. When it's time to take it off, the vest disappears completely into the back pocket of your jersey, taking up as little space as possible.