Two colorways, and the difference isn't only color. Kona Gradient comes with Terra polarized crystal — a warm brown lens that filters reflected glare off roads, water and glass. Translucent Dark Teal comes with carbon grey crystal, a neutral non-polarized tint in a frame you can see through: the acetate is translucent, so the teal shifts with what's behind it. Choose Kona if you drive or spend time near water; choose Dark Teal if you want the frame itself to be the point.

Lenses

Both lenses are crystal — glass rather than resin, which means sharper contrast, better scratch resistance and no distortion at the lens edge, at the cost of some weight. The Terra lens is additionally polarized, filtering light reflected off flat horizontal surfaces: wet roads, car hoods, water, snow. Carbon Grey is a neutral dark tint without polarization, which some wearers prefer for driving with LCD dashboard displays or for looking at phone screens outdoors.