The castelli mortirolo 4 softshell jacket is a perennial favourite among cyclists because its exceptionally good in a wide variety of conditions high intensity in cold weather yep this jacket keeps you warm but also vents a lot of moisture out the back thanks to their thermal warmer fabric lower intensity in mild conditions yep just open up the zippered front vents and use a lighter back layer the only real trade off here is that castelli didnt build in real water repellency other than