Athlon builds optics to withstand the elements no matter what class of binos they are in. They figure if you spend any time outdoors you will be near water and your equipment might spend some time in it. The Neos series of weatherproof binoculars are built tough with a composite chassis that’s O-ring sealed and nitrogen purged for 100% waterproof/fog-proofing. So if you run into foul weather or take a 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.