So I thought I'd buy a times Dikies trousers with the corresponding knee pads. I got the saver respectively inserted into the slot and losgelegt on his trousers. I knelt all day, have tiled and grouted and worked a lot on the ground. I can not say other than, my knees were burning like fire it. Not only that are very firm and the parts are made of plastic. After 9 hours of continuous use, I do not have it anymore. I am looking Tiles and what I'm talking. These pads are discharged. I will again take my traditional foam saver. You can learn something new every day. My conclusion: let it alone if your knees are to live long.