Stainless, after I wear it no one will want near it............ it's sewn to my shorts.............
Seriously, when Stringfellow and Kirk crashed last year, I was next in line on the long course, and the starter hadn't been told at that point how long it would be for cleanup.
After about five minutes, he sent someone over to tell me it would be a while, and I chose to stay in the car............. between my Kool shirt, and my helmet cooler I just sat there and "chilled".
I actually would shut the shirt switch off every few minutes because it was too darn cold.
Keep in mind I was wearing nomex "long john's" and a nomex head sock besides the SFI 20 suit.
As a small note, I looked at a "comerciallly sold" helmet cooler on line that was over $300. bought the same fan from Grainger for $35., bought a small Igloo "six pack " ice cooler, installed some 1" coiled tubing, and clear coiled hose from a roundy round supplier, and walaa... spent less that $100. on the whole enchelada.
With the new rule last year I had to buy fire resistant covering for the hose, and I also wrapped the intake and fan unit.
If I knew how to post pictures I would show you the inlet.......... its a 56' Cadillac Limo rear air conditioning vent turned backwards and mounts on the top of the rear quarter panel.
I installed a identical setup on the opposite side which ducts air from a second fan (identical to the cooler fan) and pulls smoke and fumes from inside the car. Bob
p.s. the helmet cooler box also holds one twelve ounce can of your favorite beverage...........
Stan, what about when all you roadster guy's pee your pants during a spin? That ought to boil your tough old hide ... or at least tan it.....