KRUGER Optical 61313 Backcountry Waterproof Roof Prism Binoculars Broadband antireflection high fidelity coated optics Bak-4 phase coated prisms for superb image clarity &lt;1.3m focus with internal center focus system; Excellent long eye relief with twist-up eyecups Rugged metal body construction; Textured armor for excellent grip Waterproof/fogproof/nitrogen processed; COOLNECK quick release neck strap