The FIA has relaxed the rule on drivers changing their helmet livery for the Monaco Grand Prix, leading to a number of drivers to run substantially different helmets for the Monte Carlo race weekend.
Last year, the governing body issued a new regulation which banned drivers from changing their helmet livery substantially as it can confuse fans as to which driver is behind the wheel.
"In order for drivers to be easily distinguished from one another whilst they are on the track, the crash helmet of each driver must be presented in substantially the same livery at every Event during a Championship season," according to Article 9.1 of F1's Sporting Regulations.
However with Monaco considered the sport's blue ribbon event, the FIA has informed the drivers that special one-off helmets will be permitted, but they must return to their original design after the event.
Romain Grosjean (above) and the Williams drivers are just a few who have chosen to race with a special Monaco helmet.
.@MassaFelipe19's special helmet for the #MonacoGP weekend, courtesy of graffiti artist @OsGemeos pic.twitter.com/wrloheOBlX
— WILLIAMS RACING (@WilliamsRacing) May 25, 2016
.@ValtteriBottas and his special helmet design ready for #MonacoGP #FP1 pic.twitter.com/w1ObJUrC5S
— WILLIAMS RACING (@WilliamsRacing) May 26, 2016