Ergodyne Kneepads have a soft contoured foam that is designed to be comfortable and stay in place. They have a heavy-duty strap that keeps them securely in place. These kneepads are great for mechanics, carpenters, roofers, plumbers, and anyone who works on their knees. Ergodyne Kneepads are available in sizes small, medium, large, and extra-large. They are also available in a variety of colors including black, blue, green, grey, and red.