The Vortex Raptor 10x32 Binoculars offer excellent viewing quality in a robust, wide-angle design with 50-70mm adjustable interpupillary distance. All air-to-glass surfaces have multiple layers of anti-reflective coating for optimum light transmission, adding superb color fidelity and brightness to everything you see. Your optics are well protected from your environment with an O-ring sealed, nitrogen purged body that can't be damaged by water or fog. The Raptor 10x32 Binoculars are also covered with a protective layer of rubber that gives you a secure grip and extra durability. The diopter on the right eyepiece allows you to compensate for differences between your eyes, allowing you to individually adjust each eyepiece. The twist-up eye cups make this model usable for eyeglass wearers as well. The Raptor 10x32 Binoculars are backed by Vortex's unlimited lifetime warranty.