This is a protective lining, similar to knee pads, and it is a protective device. Generally speaking, you can go to a large Nike store. If you want to say professional, it is MC David. As you can see, Kobe Bryant's vest and Wade's underwear, including NBA brand protective gear, are basically from this brand, but compared with other brands of protective gear, the price is also very high. At present, I only live in Wangfujing, Beijing.