All my clothing are size small and assumed this one would have been the same fit. I bought them at the end of the season on a sale, so I didn't get to use them until following fall and was very disappointed. It's so tight that my leg's circulation were getting cut off and became uncomfortable. I had to remove them in the middle of the ride. I couldn't return them anymore so I'm stuck with them. If you will buy them, get one size bigger.
I had the older version which I loved, and these are just as good, if not better.
They have a gripper on the inside at the top which keeps them in place. They also come down just below my calf and they stay there. Perfect.
They keep me warm at 50 degrees, and I didn't get uncomfortably warm when it was 65.
I'm 5'9 160's and have a 33 inseam. The Medium fits me perfectly.