Features: HD Optical System for maximum light transmission, contrast, and resolution. Fully-Multi Coated lenses for maximum light transmission. The reticle is etched directly into the glass for a more precise and feature packed design. Keep your glass clear with Bushnell's exclusive EXO Barrier lens coating that repels water, oil, dust, and debris. IPX7 Waterproof, and Fog-Proof construction. Nitrogen purged to prevent fogging from the inside even with extreme temperature shifts. 1 inch single-piece shockproof tube, constructed of aircraft grade aluminum. Side focus provides easy focusing at any range, without adding length to the scope.