Quality is key for Burris. This quality comes from the proven manufacturing processes and superb materials found in all of their optics. For Burris lenses, the highest grade of glass is ground and polished to exact tolerances, after which the Burris HiLume® multi-coating is applied to ensure 95% light transmission, which gives the user an extraordinarily bright image, which is especially important during the twilight hours of dusk and dawn. Fog and waterproofing is achieved after 24 cycles of nitrogen filling and purging, so the image is never obstructed. The time and effort it takes to remove every trace of moisture is extensive, but the effect is immediately noticeable to those hunting and shooting in harsh conditions. Their proven track record and continued commitment to quality has set Burris ahead of the competition for sport, hunting and tactical optics.