Prevention: 1. Asian sizes are 1 to 2 sizes smaller than European and American. If your size is between the two sizes, please choose the larger size. Due to manual measurement, please allow 2-3cm difference. 2. If you don't know how to choose the size, please check the size chart carefully before you buy the item, please contact our customer service. 3. As you know different computers display colors in different ways, the color of the actual item may be slightly different from the image below.