1, wool hat: wool hat is a kind of hat made of soft wool, which can be easily shaped and resized, similar to the earphone of APM earphone, and it is more comfortable to wear.
2. Baseball cap: The bottom of the baseball cap is relatively flat, similar to the headgear of APM headphones, which is convenient to wear and can shade the sun.
3. Adjustable cap: The adjustable cap is a cap with an adjustable shackle or button, which can be adjusted according to the size of the head circumference, which is similar to the headset of APM headphones and is more comfortable to wear.