What changed
The FIA has declared the Singapore Grand Prix a heat-hazard race, the fourth such designation of the 2026 season and the second consecutive weekend with one.
Teams may fit cooling systems that circulate liquid through a vest worn by the driver. Drivers who do not use one must carry 5kg of ballast, preventing the choice from becoming a performance advantage.
Why it matters
Singapore is punishing even after sunset. Temperatures are expected to stay around 30-33C, with high humidity, and cockpit temperatures can rise above 40C. George Russell and Lewis Hamilton were treated for heat exhaustion after the 2024 race.
The cooling system solves one problem while creating others. The liquid may warm up before the race ends, especially because Singapore hosts the longest grand prix of the year. Some drivers also find the cooling top uncomfortable in the tight cockpit.
Mercedes has decided against using the system, saying the FIA’s allowances were too small to develop one robust enough for the full race. The FIA offers up to $50,000 for a system that keeps the liquid cool throughout and another $75,000 for making the vest comfortable.
That leaves teams balancing driver temperature, comfort and car performance. The key question in Singapore is not simply who has the cooling kit, but whether it still works when the race reaches its hottest and longest stretch.
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