Ideal for birdwatching, these stylish premium quality, rubber armoured, modern open-hinge models combine light weight (magnesium alloy body) with excellent optical performance. Employs exotic ED (Extra low dispersion) glass for superior colour fidelity. Features high-index Phase-Corrected Bak-4 prisms and full broadband multi-coated optics. O-ring sealed and nitrogen filled for waterproof, fog-free performance. Twist-up rubber eyecups for spectacle wearers. Eye relief is 18.4mm and 15.2mm respectively (8x42 & 10x42 models). Supplied with neckstrap and case. Colour/material: Green rubber