Lisa, I have to admit that I haven't found the right weather situation for the bolero. I just usually opt for the arm warmers, because you can push them down while riding, but I would have to stop to take off the bolero. I got hot very easily.
I wore the bolero twice while commuting to work. It was abnormally hot for 6 AM, around 61 degrees both times and humid. I had a vest on over the bolero, which came off after the first 2miles of downhill. After about 7 miles, I had to take the bolero off, but I put the vest back on for awhile over my ss jersey. Then I ended up taking it off at mile 11 (of a 13.8 mile ride). It was very annoying to have to stop. I will try it out again in the fall. But it fits perfectly.