The Boreal sports sunglasses are the most innovative product introduced into the sports sunglass market in more than twenty years. Along with the Boreal's aggressive design, the SWITCH™ patented magnetic interchange system sets a new high for technological innovation, styling, and sports performance. The Boreal sports lenses encourage aggressive performance from every angle. Magnetic Interchange Lens System - Switch uses high-energy magnets embedded in the lens and frame to enable users to swap lenses quickly and easily as light conditions and activities change.