I was out in RB yesterday for 9 hours subjected to 90+ degree temps and not a cloud in the sky.
I wore a bathing suit, t-shirt (shirtless at times), my PFD, a white baseball cap, and polarized shades. I lathered up twice with SPF50 sport lotion and hardly got a tan, if at all. I dont like to wear long sleeves or pants because I overheat in a flash. Choosing a water resistant sun block is key and reapplying is a must! Lots and LOTS of H2O!!!!!
"Hats should be light on top to reflect sunlight and dark on the underside to reduce light reflection. When light bounces up from the water and hits the underside of a light colored brim it is reflected right back on to your neck, nose and cheeks. A dark underside will counter this effect.
I like this one:
I never thought about the color of the underside of the hat. I'l look for somethin like this. Thanks