These glasses all come with different lens to interchange, a light, dark, and mid-light option, for all year round use.
Chukar Red frame - 3 lenses: clear-light smoke-dark smoke
Chukar Silver frame - 3 lenses: clear-persimmon-dark smoke
Chukar White frame - 3 lenses: clear-light brown-dark brown
Flint, Guppy, Shark - 3 lenses: clear-persimmon-dark smoke
Stingray - 4 lenses: clear-persimmon-dark smoke-light smoke