There isnt much wind coming at them. They are fully enclosed in a cockpit with only about half their head sticking out and that part is covered by a helmet. They have added an air duct this season that flows a tiny amount of air into the cockpit but it’s really small because this technically slows the car down. Additionally, they are wearing multiple layers of fireproof clothing which don’t breathe at all. They are also sitting directly in front of an engine that puts out around 800 HP and they are physically exerting themselves. So imagine doing a workout in a gym with the heater on dressed like it’s the middle of winter. It get very hot. And when it’s humid, your body can’t release the heat
Many reasons actually
1) most of their bodies are actually inside the car, not exposed to the elements
2) they wear a few layers of protective gear
3) they sit really close to the engine, the temperature inside the car can get upwards of 50c
4) physical stress on the body while driving at such speeds
5) outside temperatures also have an impact
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