Carson Optical 3D Binoculars - Carson Optical 3D HD Binocular combines phase-coated prisms with Carson Optical's own HD lens-coating technology. They are rubber armored, nitrogen purged and O-ring sealed making it 100% waterproof / fogproof, and shock-proof. Long eye relief with twist down eyecups also make this 3D binocular perfect for eyeglass wearers.