Smith Slider Series Polarized Toaster sunglasses feature removable interchangeable lenses. Among Smiths line of sunglasses, Sliders are the call for multiple sports and varied light conditions. The Slider Toasters are one of Smiths most popular shades, and as with all Slider Series shades, each pair comes with 3 lens sets for specific light conditions, depending on your frame color choice. The Polarized Toaster offers polarized lenses featuring Horizontal Glare Reduction, or HGR. Horizontal Glare Reduction is a filter designed to specifically filter out 99 of reflected glare, resulting in enhanced visual acuity and reduced eye fatigue. Toaster frames wrap slightly around your head to minimize the effects of wind, snow, glare and errant tree branches. The Toasters in particular offer the smallest Smith frame available. Only one set of lenses is Polarized. The replacements are not.