From California Polytechnic State University: "The brim area of these hats is excellent, in fact we have never tested anything with 0% transmittance. Congratulations on this protection!"
*For sun protection choose a hat with a 3" brim or larger.
*Hats with vents (lattice) will not provide protection to that area.
*Water, sand, snow, and pavement can reflect the sun. Use sunglasses and sunblock with your hat.