Waterproof and fog-free with nitrogen gas filling. • Waterproof (up to 1m for 5 minutes) and fog-free with nitrogen gas filling • High-eyepoint design provides a clear field of view even for eyeglass wearers • Turn-and-slide rubber eyecups with multi-click facilitate easy positioning of eyes at the correct eyepoint • Multilayer-coated lenses and large objective diameter for optimal image clarity • Rubber armouring for shock resistance and a firm, comfortable grip • Eco-glass optics are free of lead and arsenic