Using these Alta CONTOUR knee protectors is easy. First, adjust the straps to fit your knees comfortably. Make sure the wide - set straps are evenly placed to avoid bunching. The pads should sit firmly on your knees without sliding down, thanks to the grip strip and non - slip rubber strip. When putting them on, use the Original AltaLOK Easy On/Off locks for a quick and secure fit. As for maintenance, you can gently wipe the pads with a damp cloth to keep them clean. Avoid using harsh chemicals as they may damage the materials. Keep them in a dry place when not in use. Remember, these knee pads are sold as a pair with fasteners on the right side of each pad, so ensure you place them correctly on your knees. They are adjustable to fit most sizes, but if you find it too tight or loose, just adjust the straps accordingly.