Cryogenic Boot/Helmet - External cryogenic liquid filled reinforced boot/helm
For use OVER ppe gear.
Was speculating whether maybe a boot, helmet, bracers etc with built in pressurized cryogenic liquid compartments put on over any type of ppe gear- would work to cool parts of the body without compromising or altering the protective gear.
Preferably an inert non toxic gas but seeing as it's in a reinforced compartment maybe ammonia could be used (NASA use ammonia) Possibly even liquid nitrogen or a similar cryogenic liquid.
Maybe compartments that can be topped up and re-pressurized through valves similar to gas cylinder valves.
One possible drawback would be the enormous pressure the liquid gas capsules would be under in order to keep the gas cold. (Sole as one compartment?)
Another drawback is these are new and not immediately deployable but still worth looking into.
Please feel free to speculate and point out problems or solutions in the comments section, it's all helpful!