Whether a new motorcycle rider wants to buy his first helmet or a veteran wants to replace an old or broken helmet, the most troublesome thing is to make sure that the new helmet he is going to buy is suitable for him. Frankly speaking, this is not an easy thing. Asians do have a variety of brain types. They are generally rounder than Europeans, with a wider head and a more square face. Not to mention that Chinese people also have a special tradition that people all over the world do not have: when children are born, they should sleep on hard pillows and sleep the back of their heads flat. The old people said that the back of Ping's head was more beautiful. It was not clear whether the crocodile was really beautiful, but it was true that it would bring some trouble to choose a helmet.

Generally speaking, the most important way to choose a helmet size suitable for you is to measure your head circumference. The specific method is also very simple: use a tape measure to circle the widest part of the upper part of the ear, and measure the circumference. The specific figure of the circumference is your head circumference, which is generally measured in centimeters; After obtaining the head circumference, you can determine your helmet size according to the size chart provided by the helmet manufacturer. Take Arai's helmet as an example. A head circumference of 57cm - 58cm requires a helmet of size M. It is worth noting that each helmet manufacturer has a different size setting standard. Make sure you judge your size according to the size chart of the manufacturer who wants to buy the helmet, because there may be differences between manufacturers, leading to the wrong size.