I have had these tights for a month now, and they are great for those chilly 40-degree early morning rides. I am 5'9 140 lbs., ride approx .400+ fast miles every month, and the medium size fit me perfectly. They fit very snug, hence the term "tights" and they fit flawlessly over my existing riding shorts. After I have put them on, I completely forget I am wearing them, and only think about how cozy they are. Any slight extra legging at the bottom of the tights can be used to cover the sock and shoe area to fight the chilly winds.
Legs are very tight for the length; hard to pull on, you have to gather them up and unravel them up your leg. They can feel tight and bunch up around the knees. Material is quite thick.