Let me just talk about Pyro’s suit for a moment because people seem to be thinking it’s made of rubber of some sort.
What they wear, by observation, seems to be similar to that of a Asbestos fire suit of WWII. These suits were made of Asbestos fibers and cement due to asbestos high resistance to heat, radiation and chemical reaction. As shown above these are proximity suits used by pilots of the Second World War so that if their plane catches on fire they would not be injured by the flames that were as high as 2,000 degrees.
They were used also as suits that could withstand direct open flames temporarily without burning as well as not causing a chem reaction. It wasn’t until the late 1970’s that they started using aluminium aloids instead of asbestos, because of abestos high toxicity level and very high chance of lung damage for prolong usage.
So the chances that the pyro may have some serious lung issues, not because of smoke inhalation but because of the toxic suit they wears is very high.
Another thing is that these suits were very large, they had a circular arch around the hip that had straps attached that were slung over the shoulders to keep the skin to suit contact to a minimal also decreasing the chances of injury to the wearer, this does not mean pyro is fat, it evades no clue to their body type at all.
So just for reference, you know.