Their high-index BaK-4 prisms and fully multi-coated lenses deliver crisp, clear images while waterproof, fogproof and dirtproof features help to ensure a great viewing experience under a variety of weather-related conditions. Additionally, long-eye relief capability and the binoculars' twist up/down eyecups make them more comfortable to use over extended periods of time.
For waterproof and fogproof performance.
