The role of knee protection has three points, one is braking, the other is insulation, and the third is health care. Insulation is not much to say, the knee part is very easy to catch cold, many knee diseases are related to the cold of the knee, especially in the mountains, the mountain wind is very cold and very hard, often the leg muscles will feel very It is not hot, but the knee is not hot due to lack of muscle movement. When people feel comfortable to cool the legs, the knee is actually getting cold. At this time, if the knee pads are worn, the thermal insulation of the knee pads can be reflected. .