Total Comfort knee pads provide industry leading foam cushioning for maximum comfort and protect. They have a patent-pending dual layer progressive resistance foam padding and an ergonomic no pinch strap, so the knee pad never pinches or binds behind your leg. The fabric is also weather proof, so it will repel water, oil, and chemicals. With a durable construction and the ability to be machine washed, this knee pad will last for years to come. To top things off, this is the first and only Doctor Recommended knee pad. The padding is so good that is has special approval for Knee Replacement patients.