Whether you're going on an exotic vacation,fishing trip or just weeding your garden, your head needs protection from the sun. The Skin Cancer Foundation recommends wearing a hat with at least a 3" brim to shield face, ears and neck. To win their Seal of Recommendation, sun-protective fabrics must have a UPF of 30 or higher. A hat with a UPF of 50 allows only 1/50th of the sun's burning rays to get to your noggin,