Knee Support Brace Adjustable 
Movable padded buttresses for added compression and pain relief. Adjustable hook and loop closure for custom fit.
Measure the knee to be protected (you likely figured that). Stand and bend your leg just less than 45 degrees, measure around the largest part of knee, directly over the patella (kneecap).
Knee circumference (cm)
Knee circumference (inch)
|S/M||30 – 38||12 – 15”|
|L/XL||38 - 51||15 – 20”|
Maybe a bit early to be writing a review but so far it's been working well. I can wear it for hours without discomfort and I have better mobility while wearing it than without. So far I am happy I bought it.