Yes, saftey first! But you don’t have to bring your own because you will find a TIER helmet in the trunk of the e-moped.
The usage of a TIER helmet is included in every e-moped rental.

May I use my own helmet?

Yes, if your own helmet fulfils the legal requirements in Germany, you can use it for yourself or a person you want to ride with you. Please keep your inside of our rules and always inside of the legal traffic rules: