@RickyCage I got these a few months ago and they work great, was in bondage on my knees on a hard floor for close to 2 hours at one point and my knees were fine. They are a little derpy looking if you're standing up with them on. Wrestling knee pads may work better if youre doing lots of moving around and changing from kneeling to standing.

https://www.homedepot.com/p/QEP-F3-Stabilizer-Knee-Pads-with-Memory-Foam-Gel-Cushion-Neoprene-Fabric-Liner-and-Pen-Storage-79642/310828821