Using these Alta CONTOUR LC Knee Protectors is easy. First, open the adjustable straps using the AltaLOK Easy On/Off locks. Slide your knee into the protector and make sure the non - slip rubber strip is on the back inside of your knee. Then, fasten the straps, adjusting them to fit you comfortably. When you're done using them, simply remove them by opening the locks. As for maintenance, you can wipe them down with a damp cloth to remove dirt and debris. Don't machine - wash them as it might damage the materials. Store them in a cool, dry place. Remember, these knee pads are sold as a pair and have fasteners on the right side of each pad, so make sure you use them correctly for the best fit and protection.