These tights make me want to run faster. The compression makes your muscles feel like they are being massaged while you run. I am 6 feet tall, 165 lbs and I have a size large. It fits great, but hits a little above the ankles ( can be covered with taller socks). Also the top of the pants are very high, righ at the small of you waist. I have large calves, hips and thighs, but the compression feels just right. You put the tights on like panty hose because they are so tight, but when you run it feels like you are wearing nothing. They keep you warm down to about 20 F and are still comfortable in the 40s. There is a drawstring at the waist (that I don't use) and a little key pocket. Make sure you adjust the tights so that the "X" pattern is just below your knee for support. Love these, I know they will get me running in the cold weather for years to come.