BAK-4 glass prisms for optimum resolution; Phase Correct coated prisms for optimum color fidelity; Dielectric Coated prisms for maximum light transmission; Hi-Lume Index-matched fully multi-coated lenses for optimum resolution, light transmission and glare omission; Ultra-rugged body; Robust metal eyecups for unusual ruggedness; Nitrogen filled for waterproof and fog-proof performance even in harsh weather extremes; Durable carrying case and neoprene neck strap for all-day comfort; Rubber armored with unique non-slip texturing; Fast focus, center wheel