The fog at HHN is water based. Your friend's pants are doing nothing but overheating him. In fact, the company HHN uses for fog is owned by a man with asthma. He sits in the stuff and breathes it all day. I order about 1 ton of the same fluid every year. Universal is one of their biggest clients.
"100% American Made - ... only uses De-Ionized Water and Pharmaceutical Grade Chemicals, all Approved by the FDA."