After reading all these comments I almost...
After reading all these comments I almost feel more confused than before! I am 5"7, and weigh 136 lbs, and therefore fall inbetween the S and M. If I want to ensure maximum support for my knees, would I be best to go for the S?
I own 4 pairs, all size small. They are a chore to get on, but once they're on your knees are going anywhere. They feel great and really do make a different in fatigue, endurance, etc. Just remember you want them tight!!
Yes, I would go with the S since I've bought both the larger and the smaller of 2 sizes I was between and really like the smaller size more. I will say the larger size was easier to get on but the smaller size kept the fatigue down more.