Another way to cool the suit is use that water pump idea, but put that on a t-shirt underneath the whole thing. Hollywood does it cheaply for actors in fat suits and if they are wearing a big rubber/leather suit like this. Could use the shirt, and maybe make one to fit a balaclava? Just a suggestion. Usually my suggestions get shot down with rude remarks by "experts" who love doing nothing more than insulting remarks and sulking others' intelligence rather than constructive criticism and kind suggestions. Anywho, like I said, food for thought.