Brunton Binocular Eterna Compact 10 x 25 Small enough for your pocket but tough enough for your truck bed, the Eterna Compacts are made to pack. Backed by a lifetime warranty, the Compacts are built with BaK-4 prism glass and, like all Eternas, feature state-of-the-art multi-coatings and new twist-up eyecups with multi-step long eye relief. Protected by our new Bino-Glove neoprene lens covers, these new Eternas add brilliant performance to the new list of requirements for compact optics Their top of the line ETERNA® series create a visual symphony of brightness, clarity, field of view, magnification and precise focusing capability. Coated lenses, eye relief and waterproofing are standard features Brunton delivers, because they are expected by their customers.