1. First of all, if the helmet lens film is torn off and cannot be returned, you can contact the official customer service to explain the details and negotiate whether it can be returned.

2. Secondly, if the merchant clearly stipulates that it can't be returned, it is necessary to leave the product on its own.

3. Finally, if the helmet has product quality problems, you can contact customer service to apply for a return to protect your legitimate rights and interests.