Overview

• The FIA issued its first official heat-hazard sign for Singapore after forecasts reached 31C, which triggered a requirement to install the cooling system.
• Use of the cooling vest remains optional this season, with drivers who opt out carrying an additional 500g of ballast to maintain parity.
• Max Verstappen confirmed he will not wear the vest in Singapore and called the idea of a 2026 mandate "ridiculous."
• The FIA said a mandate for 2026 is under consideration rather than settled, following a drivers' briefing in Singapore and continued dialogue.
• Feedback across the paddock is divided, with George Russell citing benefits from earlier trials and others questioning comfort and effectiveness.