Pegasus makes a shirt with cooling capabilities.

There is a can of coolant that you can spray through the suit to cool it off.  The can is smaller than a paint can.

It  works, but it is just one more thing to keep up with.

We settled on an Under Armour cool shirt

Just drive the darn thing! Lol

We experience 105 to 115 degrees here in Bakersfield California decert

And also at Button Willow Raceway, along with Willow Springs raceway, and some times is pretty humid.

Sorry, I’m just feeling smarty today, LOL

Bo is right, there are a few cooling shirts and underware to keep you cooler to some degree, and it does make a difference, by lowering the temps a bit

I would try that stuff before I spray anything on my clothes or flesh

The water system, of liquid cooling system seems a little complicated, and as mentioned previously, it’s just another thing to go wrong with. Fast Freddy.

Cooling your head may be more beneficial than cooling your body, though they’re related… I wonder if you could plumb a righetti ridolfi brake cooler to the inlet on a vented helmet spigot… :)