Few things this small deliver performance this big. The Brunton Eterna Waterproof Compact Binoculars feature top of the line BaK 4 prism glass and Emerald Fire full multi-coating. The Etrna is waterproof, fog proof, features tough ergonomic body armor, long multi-step eye relief, and your choice of 8X or 10X power. All covered by a limited Lifetime Warranty.