Drivers regularly endure 120-degree cockpit temps and 5 to 10 pounds of sweat...

https://direct-wiki.win/index.php/Beyond_the_Cockpit:_The_Brutal_Physics_of_High-G_Racing

Drivers regularly endure 120-degree cockpit temps and 5 to 10 pounds of sweat loss during a race. In this piece, we break down how professional racing recovery is evolving beyond old habits