Overview

• Singapore became the first F1 event formally designated a heat hazard, triggering a rule that teams fit in-car cooling systems while vest use remains optional.
• Max Verstappen said he will not wear the vest in Singapore and called a potential 2026 mandate ridiculous, arguing the decision should remain a driver choice.
• Lewis Hamilton also urged the FIA not to force the device on drivers, saying it should be optional despite potential benefits in extreme conditions.
• The FIA confirmed a mandate for 2026 is under consideration rather than decided, with the topic discussed in the drivers’ briefing and open to further consultation.
• Opinions are split on effectiveness and comfort, with George Russell and Carlos Sainz citing benefits, Oscar Piastri unconvinced, and parity enforced via added ballast for those who opt out with reports differing on the exact weight.