Trijicon 10x42 HD Binoculars Fully Broadband Multi-Coated Fluoride Lenses facilitates superior light transmission, color fidelity, clarity and avoids chromatic aberration Waterproof and Dry Nitrogen Filled - Stands up to all weather conditions and eliminates inside lenses from fogging Magnesium body's high-strength to low-weight ratio means a durable and lightweight binocular Rubberized armor aids in a better grip and offers extra protection from rugged use and weather conditions Ocular lens focus system - Precise image clarity can be achieved with the center focus knob and right hand diopter ring