The technical details behind this binoculars Vanguard Vesta 10x42 Binoculars provides a long eye relief and wide exit pupil to make this an optic that is comfortable to use all day in the field. Made with compact BAK4 roof prisms and anti-reflection Multiguard multi-coated lens surfaces to boost the light-gathering ability and produce bright and clear high-contrast images with accurate color representation. Designed to withstand the rigors of the outdoors, the chassis is made of lightweight and durable material, and each optical tube is sealed to be waterproof and resistant to internal fogging, so the binocular will continue to perform in even the most inclement of weather. It is wrapped in a protective rubber armor to deliver a slip-resistant grip. With an ergonomic form factor, the Vesta can easily fit in most packs for transport.