I have lower back pain so I can't use the normal mops to mop our timber floor. Instead I use cloth wipes to do it. So I knee down on the floor. Over time my knees get sore. So I decided to make a pair of pads to cushion between my knees and the hard floor. They work quite well, except that the elastic was cut a bit too long so they keep going down and I have to pull them up from time to time.
I used quite a few layers of polar fleece scraps and padding scraps to make the cushion, sewed them onto the pink layer, then sewed the pink layer together with the green layer, with elastics. Now no more sore knees!