Fishing in the outdoors can be a photo damage hazard. "Photo damage" is a sexy way for describing the precursors to skin cancer. And I, too, have learned that a baseball cap that only covers your beak might still leave you (sometimes painfully) half-exposed (neck, ears, and so forth) to the harsh rays of the sun. Considering how much time I spend on glistening waters, I now usually cover all my bases... especially in midsummer. And that means sweat-proof SPF 30, applied at least 30 minutes before I step out into the glare... and also wearing the full-brim hat.