Fully Multicoated Optics provide multiple layers of anti-reflective coating on all air-to-glass surfaces maximizing light transmission, brightness and contrast. ED (Extra-low dispersion) Glass reduces chromatic aberration to a remarkable degree, providing clear images with superior contrast. Wide Field of View Binoculars have fields of view of 60% or greater. Field Flattener Lens System delivers sharp images all the way to the edge of the field of view. Long eye relief provides 15mm or more of eye relief - perfect for eyeglass wearers. Armor Lens Coating provides scratch-resistance coatings for eyepiece and objective lenses. Locking diopter control maintains your personal setting. Turn & Slide eyecups are perfect for use with or without eyeglasses. Waterproof and O-ring sealed to prevent moisture from entering body. Fogproof - nitrogen purged for total reliability against thermal shock. Magnesium Alloy Body is lightweight and incredibly durable. Flip-Down Objective Covers are included along with replacement rubber objective trim rings.