Vortex® Viper HD Binoculars step up their game with HD (High Density) extra-low dispersion glass in one of the lightest full-size binos available. It's no mystery why the Vipers are award-winners—they pack in all the features you could possibly need for a hunt. Other features include XR anti-reflective coatings, roof prisms, Phase Correction coating, ArmorTek® coating and rubber armor, twist eyecups, center focus wheel, and locking diopter. 100% waterproof/fogproof. Tripod adaptable.