The 2025 Singapore Grand Prix has been declared Formula 1’s first official “heat hazard” race by the FIA, marking a historic introduction of new safety regulations to protect drivers from extreme heat conditions.
The decision follows forecasts indicating that the heat index during the race will exceed 31C, a benchmark set in the governing body’s regulations enacted earlier this season.
This classification mandates special provisions to reduce the risk of heat-related health issues for drivers navigating the Marina Bay Street Circuit, a track notorious for high temperatures and humidity.
This heat hazard declaration comes in response to physical struggles witnessed in previous races, particularly the 2023 Qatar Grand Prix, where drivers faced extreme cockpit temperatures often approaching 60C.
During that event, several competitors experienced severe symptoms, including dehydration, vomiting, and even fainting inside their cars.
The incident prompted the FIA to explore technological solutions, leading to the development of a cooling vest system designed to circulate coolant through specialized tubes embedded in a fireproof shirt worn beneath the racing suit.
For the Singapore race, drivers may choose to wear these cooling vests during the event. Although the use of the vests is not mandatory this time, all cars must be equipped with the cooling system regardless to ensure fairness.
If a driver opts out of wearing the vest, the car must carry an additional 0.5kg of ballast to counterbalance any potential advantage from reduced weight.
This maintains competitive equality among drivers who make different choices regarding the cooling technology.
The cooling vests have been tested at multiple points during the 2025 season by various teams and drivers. Although most of the feedback has been optimistic, some have also noted the discomfort the vests can cause in the confined cockpit environment.
Mercedes driver George Russell tried the system during the Bahrain Grand Prix and commented on its potential benefits, particularly under extremely humid conditions similar to those expected in Singapore.
Singapore’s Marina Bay circuit presents a uniquely gruelling challenge due to its tight layout combined with tropical heat and humidity.
The high physical demand has drivers losing up to three kilograms during the race, emphasizing the importance of keeping core temperatures manageable.
This heat hazard designation aims to mitigate health risks such as reduced cognitive function and impaired physical performance, which could otherwise compromise safety on such a demanding track.
