The deep red mirror lens features a brown base to maximize your vision at high velocities, especially with full sun exposure. When clouds take over or dusk begins its descent, quickly swap out the lenses using MAG' interchangeable technology. Simply press down on the temple and detach each arm. Pull the rose flash lens from the included zip case, snap the arms on and slide the two-position nose piece into place. Smith's Attack Sunglasses offer all day comfort. The low-brow design increases ventilation, while megol temples absorb moisture for a no-slip fit. No bouncing or jostling on rugged terrain. And the arms are compatible with most helmets. These technical sunglasses feature a large, curved lens to keep dirt and debris out. The lens performance is enhanced with a hydroleophobic that repels water and resists smudging.