First, it's best to choose a belt buckle (below 1), and it's not recommended to buy a ring sleeve (below 2). Because the locking position of many belt types can be adjusted freely, the universal type and adaptability are stronger, while the ring type is too tight at first, and the more it is used, the looser it is, and it often deviates, and it starts to be tied to the crotch, and soon it will run to the waist, which is particularly annoying.

Second, the size and number of pockets in the wallet. If you only put the phone key, choose a big pocket and one or two small pockets; If you put a lot of things, such as mobile phone keys, supplies, especially the location of fixed water cups, you should choose the one with more pockets (Figure 3 below) and choose according to your own needs.