For leather shoes, the color and size of the two shoes must be absolutely symmetrical to qualify as a pair of shoes. In addition, leather shoes are generally breathable. See if his glue is sticky or not, it's everywhere. The treads on the shoes should also be symmetrical and not straight. Leather is generally not very breathable. Most sneakers are leather. Pay attention to his style, whether it has a breathable design, and whether it is light on the feet. Is the glue exposed? How flexible. For fabrics, pay attention to the pattern