The ear cushions on your AirPods Max headphones are easily attached and detached thanks to built-in magnets. A recent teardown analysis has found out that the entire headband can be detached from the headphones without even opening the ear cups. This strongly indicates that the AirPods Max were originally designed with interchangeable headbands in mind.
Headband customization coming? iOS 14.4 can see what headband type AirPods Max are using