if the weather is rain which i think is pretty much the only way to ruin Lacrosse mesh besides leaving it in the sun to long..i dont think there is a way to make the mesh waterproof unless there is somekind of spray or something. but after the mesh gets wet put a small towel or newspaper inside of the head to absorb water. also there is waterproof pockets you can put in your head. one is called a rock-it pocket and there website is http://rock-itpocket.com/ (if you want to look) and you can send your head into them and they will string your head for $50 which is kind of expensive but that is waterproof and it makes you shoot faster. also if you go into your local lacrosse store you can ask for a pocket called a traditional pocket and that is also waterproof. both of those type of pockets are not mesh though. they are i think leather and elastic or something like that. they take a bit to get used to too. hopefully that helps!
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Run it under hot water, and then let it air-dry. If that doesn't work than all you need to do is use it more, and break it in.