I've purchased a number of these for use in jujitsu classes. These classes are very physical and your equipment takes a beating in protecting you. The Shock Doctor products fit extremely well and stay in place despite all kinds of grappling, judo throws and exercises including running, jumping jacks and yoga-like stretching. I would give this a five-star rating if they were just a bit more durable. I do end up purchasing four or more each year but that's largely due to the rigor of the sport and the constant washing. I would highly recommend.