After a major knee injury in 2014, I wanted the best protection for snowboarding again in 2015. Tested and approved for a week on the slopes! When I received these knee pads at home, I told myself I was not going to stand it all day, and at the end of my week on the slopes, I could feel them anymore. It must be said that this is for mountain biking, so if we can pedal, one can easily walk, snowboarding or skiing. The protective shells are shape memory and are placed around the knee with body heat. I have only two big falls on her knees in a week, but I was really glad my protections in those moments. For sizes, see the site [...]. There is an XL size which is for the knees 42 to 46 cm in circumference and 49 to 53 cm 10 cm above the knee. For my part, I am between the hair cell sizes L and XL, I took the L and I am glad because the knee has absolutely not shake in a week.