Athlon builds optics to withstand the elements, no matter what class of binos they are in. If you spend any time outdoors you will be near water, and your equipment might spend some time in it. The Athlon Neos HD Binoculars are built tough, with a composite chassis thats O-ring sealed and nitrogen purged for 100 percent waterproof and fog-proofing. So, if you run into foul weather or take spill in a mountain stream, your Neos binos are ready for it. Rubber armor gives you a grip in slippery situations. Fully Multi-coated optics and premium-quality BaK-4 prism glass maximize light transmission and image clarity. Bak4 Prism with Composite Chassis Multi-coated Lenses Close Focus with Twist Up Eyecups Waterproof Binoculars Field of View at 1000yrds: 309 ft