Featuring interchangeable lenses, the Parole Tennis comes with the patented Competivision lens, designed specifically for tennis, and a TNS Gun lens for general sun use. The Competivision lens acts like a filter, muting all colors in the spectrum except optic yellow. The result is amazing: a tennis ball that literally pops out of the background. The wrap-around frame style protects your eyes from the elementsand the impact resistant polycarbonate lenses provide 100% UV Protection regardless of which lens you use.