One of the frustrations of using sunglasses is having them work well in varied light situations. Too often, we have sunglasses that are too dark in certain lighting situations and then too light in others. Transitions Solfx lenses no can fill this need in sunglasses optimization. Combining the benefits of variable tint according to the environment and its unique tint and color to enhance the visual performance for a wide range of outdoor activities. Transitions Solfx sunlenses bring outdoor sunglasses to a new higher level. The Solfx sunlenses are available in four different designs.