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For those looking for more than just sunlight protection, the Harley guys are big on Panoptix sunglasses. These are wrap-around designs but have a foam insert on the inside of the frames (that is, between the frame and your face) which helps seal out the wind and wind-borne contaminants. They come in several frame styles and sizes and also several different lens shadings. A bit pricey but they seem to help keep the dirt out of my eyes. The only real drawback is that they have rather wide temples which can interfere with the peripheral vision. Most Harley dealers sell them or you can visit their website.