The vast majority of their bodies are inside the car, with only the head sticking out. The aerodynamics of an F1 car is designed specifically to direct air in the most efficient manner possible so much of the ‘outside’ air won’t make it into the cockpit to cool the driver. Finally the driver has no exposed skin and wears multiple layers of fire retardant material to protect them in case of a catastrophic fire, [such as this one.](https://youtu.be/gCivN-b4FZI)
All of these factors to cause the drivers to get extremely hot during the race, combining with the physical and mental effort that they have to handle during a 3 hour race causes their body temp to climb to dangerous levels. It is not unusual for a driver to lose several pounds due to sweat after a race.
At some point, when the outside air is hot enough, wind only makes it hotter.
You can look at motorcycle wind chill charts and see around 90°F/32°C air temperature, the temperature of the wind actually becomes hotter than the air temperature the faster you go.
[Here’s an example](https://keski.condesan-ecoandes.org/motorcycle-wind-chart/motorcycle-wind-chill-chart-motorcycle-forum.html)
As others have mentioned, its the clothing. I used to race in a cheapo local race series in texas, and the first time I just put the clothes on in the comfort of my air conditioned home, i felt an instant of panic because of how hot and stifling they are just to wear. They are thick, and they purposefully dont let air pass through them almost at all to protect you from fire.
Strangely, in the middle of a race you feel nothing, your adrenaline is so high, but when you finish the race you realize you are just pouring sweat. We used air scoops made of of dryer hose to route air through the windows a bit, but its just so hot. We used to do a 4 hour endurance race on thanksgiving day, and we would switch drivers every 45 minutes. I think i lost 10 pounds of water or more each session. Then drink as fast as you can to get as much back in as possible.
And i was racing these absolutely crappy maza 1st gen rx-7s, they were good for about 1.2g’s of lateral force at best. I cant imagine what its like fighting 3 times that like these guys.
Never mind the actual insulation and suits etc. F1 is extremely taxing on their body. It is physically quite demanding, so a lot of their sweat is actually from hard work. The g forces pushing and pulling kn the body are tough. The concentration is insane.
There is a clip of either Vettel or Hamilton from top gear talking about this.
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