I do not know what the real name for this design is but I can remember seeing them in various Hollywood films like James Bond and Rambo. Not withstanding I say a hiker on TeamZPacks wearing one but I thought I could improve the design a little although I have no idea if I’ll fry my brain or not.
In the following picture the hat is now a funnel or a rain catcher. With some accessories I can filter water into my dirty bottle or catch normal rain. With drip coffee and a filter I could also make a cup of java.