The FIA has confirmed what can and cannot be allowed with regards to helmet design changes following a ban ahead of the 2015 F1 season.

Drivers have been told they are unable to make significant changes to the design of their helmets in 2015, the FIA reasoning that it makes it easier for spectators and fans to identify the drivers if they didn't alternate.

The move has drawn the ire of many in the paddock, not least Sebastian Vettel - who is known for his regular changes of helmet design -, stating that he would give any subsequent fine to charity if he is punished for using a new helmet.

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The FIA has now rubber-stamped the move with an update to its sporting regulations, stating that the helmets must retain the same substantial colours, while minor changes - such as those for sponsors - can still be made.

Other changes to the regulations include the clarification that drivers will surrender their racing number if they haven't competed for two consecutive seasons.