pop your legs in the toaster
So warm, you'll almost be begging for the temps to drop below 25 degs. Always wish my tights could be a tad longer to keep from riding past the ankles, but the grippers in the cuffs help keep 'em in place, for the most part. Must-have for frigid rides.
* I'm about a 30" in the waist, and the Medium runs just about right, if a little bit of extra material around the knees - Small would have been too tight.