These Coleman Signature waterproof binoculars are slim and weather resistant. These binoculars feature High index Roof prisms, which provide crisp resolustion and clear images. They are also nitrogen purged in order to combat anything nature throws at you. The large, multi coated objective lenses fight glare and allow plenty of light in, while the BK7 glass prisms provide a perfrectly round exit pupil. With lightweight, non-slip rubber armor and a rugged feel you will never be fumbling for these binoculars during any outdoor adventure.