The Arena does not have lockers. However, cloakrooms are available in the Grand Hall as well as at the entrance of the Pit. The cloakrooms are intended only for items prohibited inside the venue. The price is €2 per item checked in (e.g., motorcycle helmet or stroller). Deposited items must be picked up no later than 30 minutes after the end of the event.
You can find the list of prohibited items.
You can find the list of prohibited items.