For performance that won't weigh you down on long, backcountry hunts, you need the BX®-4 Pro Guide HD binoculars. They deliver the brightness, edge-to-edge sharpness, and contrast guides demand, and we've taken extra steps to eliminate glare. You won't find binoculars that work better in the worst light or reveal more in those crucial minutes at dawn and dusk. FEATURES: High Definition; Open Bridge Roof Prism Design; Twist Up Eyecups; Ergonomic Design; Phase Coated; Fully Multi coated Lens System; 100% Waterproof and Fogproof; BAK 4 Prisms; Twilight Max HD Light Management System.