Im taking the time to write to review because I appreciated the ones left while shopping! Specifically pertaining to fit/sizing.
As far as comfort and warmth on the saddle: top!notch! I'm very happy with how warm these kept me in 28 - 40 F weather in NYC. The chammy is also lovely. The fly free - life changing.
Fit: I'm 5'9 and ~150, carrying most of my weight in my tummy. I initially ordered a M but felt a bit too much compression, and tight in the torso area (surprising because I barely fill a B cup) so decided to size up to a L. Initially I was very certain about my decision, and still stand by it, but I have noticed that with wear and wash, the tights have softened, and I probably could have stuck it out with the M and they would have ended up perfect. The L now feels a bit loose on my legs and lower back, which is really not a big deal, and fit great everywhere else.