I didn't read everyone else's response but my feeling is that cycling jackets suck. Most of them are water resistant which is like riding in a Hefty bag - after just a few minutes you're sweating like a pig. The temperature between 45 and 55 is the worst for finding the right clothes. Below that I have a heavier LG jacket and leg warmers and above that it's just arm warmers. I just bought a Performance lightweight jacket but it's water resistant and still sweat like a pig. What I want to do is cut the back out and sew in some kind of mesh for exhaust.