Waterproof/fog-proof. Shock resistant. Special trajectory compensating glass etched reticle. Generous 6" eye relief. Fully-coated lenses. Rubber eye-guard. Non-shifting point of impact. Fingertip windage and elevation adjustment under screw down caps. Durable leaf spring for windage and elevation adjustments. One piece tube made of aircraft quality aluminum. Durable, scratch resistant, non-reflective matte finish. Compact and light weight. Lifetime Limited Warranty.