Castelli Leggero Vest
When you need protection from wind and light rain, the best vest is the one you have with you. So Castelli made this one impossibly small and lightweight. Castelli made it windproof, water repellent, and breathable. They also made it fit just right-close to body without binding, and naturally Castelli gave it that unmistakable Castelli style.
A very athletic fit, a size large is just a bit snug I weight 180pounds, Excellent wind protection, but also worn under a jacket in the winter has allowed me to ride in below 0 degree temperatures without being cold. Great breathability, style, fit and quality.