i went to ol wally world lastnight to look for a long sleeve shirt that was somewhat water proof....got soaked on sunday and i got the "real tree moisture management" shirt...i planned to use it as my outermost shirt...a shirt or 2 and spandex under it when it gets colder..so i got it a sizer larger as well...ANYWAYS i was just curious to what exactly is "moisture management" and is it truly waterproof or not??