Not very much. I filled a balloon with warm water an it exploded a couple minutes later. Too much heat will break down the rubber in the balloon
1897 degrees farenhiet.
The term "turn out gear" is used to identify the basic protective clothing a firefighter puts on before going into a hazardous environment, usually a fire situation. There are other terms for this...
556degrees farenhieght
Under Armour Heat Gear keeps you cool, while Cold Gear keeps you warm.