NO BRUISED KNEE GUARANTEE!!! The very thin .25 inch thick knee pad is designed with a Silicone Gel insert that absorbs the energy of a direct fall onto the floor and does not impact your knees unlike that of an EVA foam material of the same thickness where you come home with sores knees and bruises. When you pick these knee pads up you can feel the difference of a high quality gel compared to a traditional foam knee pad.