Skip the cooling vest at Monza, carry 5kg ballast: FIA's heat-hazard rule explained

Monza's 2026 Italian Grand Prix is a declared heat hazard — forecasts exceed the 31°C threshold. Drivers may wear a glycol-cooled undershirt beneath fireproof overalls. The kit is optional, but anyone who declines it must carry 5kg of ballast, closing the weight loophole that would otherwise reward skipping the system. Race day is Sunday 6 September.