Drivers who used cooling vests during the Bahrain GP in Malaysia

Thrown together so not the prettiest thing in the world. Based on review of the broadcast from the start delay – the fireproofs with the cooling system do not have sponsors so they're pretty easy to spot. Just did a quick search for reasons, if I missed any for the drivers listed as unknown let me know. Pretty close to a 50/50 split – interestingly there was no teams where there was a split between teammates.

ETA: Sorry, maybe confusing wording – this is referring to the cooling vests that are designed to be used in the car in conjunction with the mandatory cooling system. The cooling system MUST be installed and available for any race where a heat hazard has been declared, the drivers can decline to wear the vest though. They basically look like a fireproof with some tubing stuck on.