This is the short version of the brace and it elimates the pinching in the back of your leg above your calve. I have had 2 surgeries on my right knee and if I hike or bike for long distances without a brace it swells badly. This thing works the same as the longer one and helps elimate the skin pinching. It keeps my knee in place and prevents it from swelling. I carry an extra one in my backpack just in case.
The only bad thing is your knee sweats badly from the neoprene and doesn't smell the best after a few outings. You can rinse this in soap and water to clean it.