Re: Knee pads?
I don't wear knee pads for aikido but I do for iaido. The kind I prefer is not a knee pad per se but actually a knee support. It is basically a 4 mm thick neoprene sleeve, which provides just enough padding under the knee on hard floor but not enough to constrain movement. Since aikido training is normally done on a mat, the padding is on the floor so you don't need it on your knees.