The primary purpose of an AirPod case cover is to protect the AirPod charging case from scratches, dents, and other types of damage. AirPods charging cases are typically made of a hard plastic material, which can easily get scratched or scuffed with regular use. A case cover can help protect the charging case from such damage, prolonging its lifespan and keeping it looking new for longer.
In addition to protection, AirPod case covers can also provide additional grip and make it easier to handle the charging case. Some case covers also come in a variety of colors and designs, allowing users to personalize their AirPods and make them stand out.
Overall, while an AirPod case cover is not strictly necessary, it can be a useful accessory for those looking to protect their AirPods and add a bit of personal style to them.