Made from a super-lightweightand flexible soft cotton fabric that's breathable and doesn't smell, with a wide elastic band that won't cut into the back of your knees, you'll be able to wear these protective knee sleeves for hours without any discomfort How To Measure: Measure 10 cm (3 inches) above your kneecap and take the circumference of your thigh . These knee pads will fit anywhere from 38cm to 52cm. (Of the upper thigh ) Do you enjoy any of the sports or other activities (or maybe you have a child in school or college who does), where your knees are at risk of impact or other damage: Or maybe you do jobs around the house, like gardening, cleaning, flooring, construction, or roofing, where you can be on your knees for long periods of time? Either way, our Motion Infiniti knee pads cushion your knees, offering the perfect protection, letting you get on with your life comfortably and safely.