Elaborately multi-coated lenses provide an excellent viewing experience with sharp and crystal-clear images. All lenses and prisms are made from special Nikon Eco-Glass, which is produced without arsenic and lead. The carbon fiber reinforced fiberglass construction is extremely durable, waterproof, and fog-free. The rubber armor enhances shock resistance and supports a comfortable grip. The rubber eyecups can be precisely adjusted to the eye in several click positions. With the large eye relief, even eyeglass wearers enjoy a wide and clear field of view.