Using these Sendy MTB knee pads is easy. First, measure around 8cms above your kneecap and 10cms below your knee to find the right size. Then, put the knee pads on your knees. The stretchy material and adjustable lower cuff strap make it easy to get a perfect fit. The silicone upper cuff lining helps keep the pads in place while you're riding. When you're riding, these pads will protect your knees from impacts on the trails. Remember, don't wear them if they're damaged. To maintain them, you can simply hand - wash them with mild soap and water. Let them air - dry. With proper use and care, these knee pads will serve you well on many rides.