The Vortex™ Viper HD Binoculars are packed with everything you need and nothing you don't. The Viper™ Binoculars are rugged, compact and lightweight (one of the lightest full-size binoculars to date), it's easy to see why the Vipers are award winners. The Vortext Vipers include HD (High Density) extra-low dispersion glass for impressive resolution and color fidelity.