Vanguard Endeavor Ed II Binoculars use premium HOYA ED (Extra-low Dispersion) fully coated glass that enhances light transmission and gives you superb edge-to-edge clarity and color fidelity. The magnesium alloy body, and open-bridge design reduces overall weight, and provides a steady hold. Vanguard uses a non-reflective black rubber armor to cover the exterior of the Endeavor Ed II, that provides a leather like texture that improves grip in all weather conditions. Metal eyepiece housings and eyecups twist up and down smoothly, and are devoid of free play, while improving the binos durability. Rubber covered eyecups and generous eye relief accommodate users with eyeglasses. A metal focus wheel with an aggressive gear ratio brings targets into focus quickly. Vanguard Endeavor Ed II Binoculars are nitrogen purged to prevent fogging and are waterproof and shockproof. Premium HOYA ED fully coated glass Magnesium alloy open-bridge body Black rubber armor exterior Rubber coated metal eyecups Generous eye relief Metal focus wheel Waterproof/fog proof Shockproof