I work in a clean room environment making high-pressure medical tubing. Even though it's temperature controlled in the production area, the plastics extrusion process in general generates a crap-ton of humidity, and in our case the extruded tubes run through a water bath to cool them down as well. Add in the fact that I'm wrapped like a sausage in a plastic gown with gloves, hair and beard nets, and booties, and I end up sweating like hell some nights.