Alpen Apex XP ED Full-Size Binoculars - Apex XP binoculars deliver vibrant images rich in detail even in low light conditions through a combination of high-resolution ED (extra-low dispersion) glass that enhances luminosity and contrast, superior BaK4 prisms, unique PXA phase coating and HR metallic coatings. Each rugged Apex XP binocular is waterproof for all-weather performance and purged with nitrogen gas to create an internal environment that is impervious to fogging. HD – High definition ED – Extra low dispersion optical system PXA phase coating for superior resolution and color fidelity HR metallic prism coating for enhanced light transmission and brightness Waterproof Fog-proof BAK4 Optics Lightweight Fully Multi-Coated Cleaning Pen Included