This is one of the best knee sleeves I have used. However, I recommend that whatever your measurement may be, order one size bigger. I am a true medium size user but the medium size for this sleeve has a very strong elastic band at the top of the sleeve and it left a deep impression on my upper thigh and after a few days of use, (I use the sleeve pretty much all day) it would start to itch. Overall, its a great sleeve, it gives great support and stability. Sleeves usually last me about 6 months See full review