I never store them in boat. When the weather gets hot and humidly they will fire. I put in truck at end of fishing and lay on a table in garage when I get home. If you wear them in heavy rain, unfold them when you get home or they will more than like fire. I have a buddy that had his on and it stated to rain, he put on a jacket over top of it and guess what-- it fired. Anytime closed up with high humidity they will pop. I really like mine but have to be careful.