I wear a hat that looks like it belonged to the French Foreign Legion, Sahara Desert.

Long flap that comes of sides by ear and down to 2-3 below collar in back.
They easily come off and or go on via velcrol - saves the ears, neck, forehead and
my nose - not to swift on cheek bones (reflection off water will get that)

Can be found Bass Pro - Dick's - Sports Authority - Some Walmart stores,
Beals outlet