Don't forget your feet. Smartwool socks are amazing.

OP, you should check out Sam's (on Liberty St.) if you need any more winter gear while you're in Ann Arbor.

They have the best prices on wool and stuff in town. And they're a nice, all-American sort of family business.

And I used to work there while I was at U of M, so I am a little biased. ;)

+1 merino wool under a windbreaker. I wear a smartwool top (available in several different weights/thicknesses) and it's just the s***. Warm when I'm cold, cool when I'm warm, doesn't stink it up when it's sweaty and wicks. Just make sure your windbreaker is breathable or you'll get clammy from the sweat inside.

I was just at Sam's the other day. Picked up a SmartWool neck gaiter from them. Don't remember seeing anything else, but will probably go back to get some Woolrich flannels maybe..

what are you guys wearing over your longjohn pants? I have Burton lj's and they usually work fine under some shorts but it is really getting nippy in the morning here.

Bib shorts under PI tights and Under The Weather 3/4 shell pants over that. Tops, I usually go with a Patagonia long sleeve shirt, then a short sleeve jersey, then a shell. If its really bad, I'll don a hoody under the shell. A good wool scarf is worth it, and so are some winter cycling shoes.

I need to try those cold water diving gloves, tho.

When I ride, even on the coldest days (below 0 degrees F), my upper body radiates heat like a furnace.

I work the hardest (and spend the most money) on keeping my feet, hands and head warm, and then the rest of my body takes care of itself...as long as I wear short sleeve shirts or a vest with arm warmers so I can get rid of the excess heat.

I wear Docker cotton shorts year around, with leg warmers and knee socks on cold days.