Understanding why NASCAR cool suits are more important for drivers now with the Next Gen car than ever before.

There was a time when NASCAR drivers did not need cooling shirts. However, today, most of them can’t survive the extreme heat inside their cockpits without these liquid-cooled vests.

The hot air from the radiator in the Next Gen car wraps around the A-post and heads into the cockpit where the driver sits. Back when the Gen 6 was used, teams did not use a side window when they ...