The Singapore Grand Prix this weekend has officially been designated a Formula One “Heat Hazard” for the first time, following a new rule aimed at helping drivers stay cool.
Race director Rui Marquesannounced the decision on Thursday afternoon, informing teams that drivers would be allowed to wear cooling vests as ambient temperatures are expected to reach or exceed 31°C.
“Having received a forecast from the official weather service predicting that the Heat Index will exceed 31°C at some point during the race, a Heat Hazard is declared,” Marques stated.
The demanding Marina Bay Street Circuit in Singapore is known for its intense heat, humidity, and challenging conditions. Drivers can lose up to three kilogrammes during the night race, which often reaches the two-hour maximum time limit.
The cooling vests feature coolant tubes linked to pumps and a heat exchanger, though some drivers have complained during testing that they feel uncomfortable in the already cramped cockpit.
The FIA confirmed that wearing the vests will not be compulsory. However, if teams or drivers choose not to use them, their cars must still carry the necessary equipment to operate the system. Drivers who opt out will also need to add an extra 0.5kg of ballast to ensure no competitive advantage over those wearing the vests.
Saving weight is crucial in Formula One, as every kilogramme shed can reduce lap times by around a tenth of a second.
The cooling system was introduced following the 2023 Qatar Grand Prix, where several drivers required medical treatment due to extreme heat. Mercedes driver George Russell tested the vest at this year’s Bahrain Grand Prix and gave positive feedback.
“Of course, there’s always room for improvement,” Russell said. “I wanted to give it a try — so far, so good.”