When I first tried these knee pads on I thought they were way uncomfortable. Almost too undersized even though I like my knee pads to fit tight. After the third time wearing them I became more comfortable but I found that some of the stitching was coming apart off of the main pad. Instead of sending them back I got the sewing kit out and stitched them up myself. They are fine now and are not coming apart after a few rides. I like the profile of these pads but I would have to say the 661 pads are much better. I expected a little better product from Troy. Next time I'll go back to the 661s.