Matthew D.wrote a review of Leatt Airflex Pro Knee Guard on April 29, 2017
Familiarity: I've used it once or twice and have initial impressions
Used the Leatt measuring guide and bought per their sizing. Used on two somewhat short rides so far. Fits very well and stayed in place. Did not have to adjust at all. Did not notice the pads at all. They did not inhibit pedaling and weren't hot (one ride was in upper 70s). One modest crash; landed square on one knee. Not super rocky area, but pad worked - didn't really notice hit and no bruises after. Very pleased with purchase so far.