The Alpen Wings ED 8x20mm Waterproof BAK4 Roof Prism Binocular delivers an ergonomic lightweight design with super bright, sharp optical performance. It features an open hinge design that provides comfortable viewing and ED "extra low dispersion" optics for the very best in color fidelity and contrast in all light conditions. It also features Alpen's fully multi-coated, PXA phase correction coating and a silver metallic prism coating. The combination lets the Alpen Wings ED Binocular Series deliver outstanding performance that provides superior viewing to satisfy even the most serious binocular user. It has long eye relief, making them great for eyeglass wearers and twist-up eye cups that provide comfortable viewing with or without glasses.