The Monarch 5 binoculars combine legendary ruggedness with unmatched optical clarity and resolution to create the ultimate hunting binocular that is powerful and convenient. Nikon's Extra-low dispersion (ED) glass and lead free Eco-Glass is incorporated in all the prism elements of the Monarch 5 add the dielectric multi-layer coating and you have a bright, clear, and clean image. The rugged armored body is 100% waterproof and fogproof with O-ring seals and nitrogen purging. Twist up eye cups allow for comfortable viewing when using with eye glasses.