I ride four to five days a week even in the Winter. I wear my Beta RoS Jacket in 35-40 degree weather and it really keeps me warm. I like the slim form fit and soft feel of the jacket. If I need to remove the jacket, it can be rolled up easily and placed in my back pocket. The quality is exceptional and I also love the color of Brilliant Pink that matches my Castelli pants, gloves and helmet.
I should have learned from dealing with this issue with Men's shorts but Castelli sizing is inconsistent. Tends to run small. I ordered this jacket and a base shirt for my wife, both in size Medium. The base shirt fits but the jacket doesn't come close to fitting! The jacket itself is nice so I'm exchanging for a size Large. Too bad I need to pay the return fee on top of an already pricey jacket.