It grip your knee and hold it in place perfectly.
I had different kind and design of knee support due to tennis injury a long time ago. This one is very unique. I honestly admire the mind behind this one. There is nothing special into it is just the same thing to support your knee and nothing beyond that, not to heal whatever knee ailment you have. But this one support your knee the best. It is very firm, never budge nor slipped, it support your upper and bottom knee that your knee caps wouldn't even move. More firmness? just pull more and it grips your knee. As the its design it relieves your knee from pull and push pressure. the support is not just a piece of whatever material, the band has some sort of insert in it that makes its firm on hold. I run and bike with it and believe me it holds. The only thing that kind of missing the 5 star is the strap that is behind your knees, it irritates me, I think its too wide or could be the material not agreeing with my skin. loosening it make no sense.  I'm still figuring it out how I can go around it. but the most important thing is it grip your knee perfectly. I like it very much and likely to recommend you to try it.
Rating: 4 stars