Using these Alta CONTOUR EXT knee and shin protectors is easy. First, adjust the dual strapping system to fit your knees comfortably. Make sure the non - slip rubber strip on the back inside is in contact with your leg to keep the pads in place. When you're ready for work or any intense activity, the ergonomic hinged top panel will allow you to move freely. For maintenance, keep them clean. You can use a mild detergent to wash the brushed tricot liner if it gets dirty. After washing, let them dry naturally. Don't expose them to extreme heat or direct sunlight for a long time as it might damage the Neoprene foam padding. When not in use, store them in a dry place. And remember, these knee pads have both fasteners on the right side of each pad, so make sure to put them on correctly.