I did a mountain bike race a few years ago where the temps started at 20 degrees and finished in 50+ degrees. It's always challenging dealing with the changing weather conditions. One of the things I do to help cut down on bulky layers is that I put toe warmers in my bra. It makes a huge difference. I would imagine you could also put some in your sleeves too. I also put toe warmers in my shoes. I'm kind of a toe-warmer freak.

Tis the season for drastic temperature changes!