The Vortex CrossfireA(R) HD family of spotters delivers the powerful, hunting tool you've been waiting for with the proven performance and reliability you expect from a CrossfireA(R). Its wide field of view is perfect for chewing up ground in any environment. The Arca-Swiss compatible foot means out-of-the-box, mount-and-go convenience on most tripods. HD Optical System - Optimized with select glass elements to deliver exceptional resolution, cut chromatic aberration and provide outstanding color fidelity, edge-to-edge sharpness, and light transmission Fully Multi-Coated Lenses - Anti-reflective coatings on all air-to-glass surfaces provide increased light transmission for greater clarity and low-light performance Rubber Armo - Provides a secure, non-slip grip, and durable external protection Nitrogen Gas Purged - Gas purged and O-ring sealed for fogproof Tripod Adaptable - Allowing use on a tripod or car window mount Arca-Swiss foot Waterproof - Designed to withstand harsh weather conditions Fogproof - Designed to withstand a wide range of temperatures Shockproof - Designed to withstand impact Includes : Neoprene Cover Tethered Objective Lens Cover Tethered Ocular Lens Cover Lens cloth