DESC: Lightweight and durable fiber reinforced polycarbonate design. Fully waterproof and fogproof, nitrogen filled, submersible to 1 meter. Inner-focus optical design. Helicoid 4 stop eyepiece ring for comfortable eye relief. Rubber covered exterior. Phase-coated roof-prisms for brighter, sharper view. Fully multi-coated lenses for increased light transmission. Click-stop diopter adjustment. Protected by a limited lifetime warranty.