This is the original GoPro Knee Mount designed by SpeckedOut.
The GoPro Knee Mount is an adjustable nicely padded industrial strength velcro strap with an integrated GoPro flat mount allowing you to clip on your GoPro. The Knee Mount is lined with anti-slip foam to keep it in place without the need to make it so tight that you cut off circulation. Stays put on launch and in the air. A great angle for post manoeuvres training review.