The Brunton Eterna Waterproof Bino 8 X 25 is backed by a lifetime warranty. This small and lightweight (12oz.) Compact is built with BaK-4 prism glass and, like all Eternas, features state-of-the-art multi-coating and twist-up eyecups with multi-step long eye relief. The Eterna Compact compares favorably against optics at twice the price and comes with BinoGlove neoprene lens covers and neck strap.