Sold individually (you need to buy two if you want a set) I have the most problems with my right knee so I knew I wanted to try it on there. I read the sizing chart in their pictures and it shows you were to measure, according to their chart a 35-37cm should be a medium and 37-40cm should be a large, I was right at the 36 mark so I went with the Large just to be safe. These must run incredibly small because I could just barely get it on on a good day, when my knee swelled I couldn't get it on at all so I definitely will have to get another one in an XL.
As for the material it's super light neoprene. It kept my knee nice and warm which is good because changes in humidity and lower temperatures kill my knee. I noticed the difference right away when we had a rainstorm and I didn't feel it coming as bad as usual due to my knee being warmer. It isn't a sweaty warm though and I felt my knee could still breathe. The pressure is just right that it kept my knee feeling less swollen and made me feel more stable standing. I like the fact that it's all in one piece with no straps so it does not bend, bind or twist and stays smooth. There's no problem wearing it with shorts or even under yoga pants.
The quality is very durable and clean looking stitching. The pink and black coloring is very bright and bold. I don't think I will have any problems with this lasting for quite some time. To wash it I just washed it with my dedicates in the machine and then laid it out to dry.
I really like it and give it 4 out of 5 stars.
Would I recommend it to my family and friends? YES! Just buy a size bigger than you measure!
Would I buy it myself based on my experiences with this review? YES!