Alpen Optics GEM 8X26 Waterproof Fully Multi Coated, BaK4 Compact Roof Prism Binocular TECHNOLOGY - BAK4 glass provides clear, bright, high resolution images with fully multi coated optics for maximum brightness CONSTRUCTION - Compact design, O-ring sealed and nitrogen filled for waterproof and fog proof security LENS COATINGS - PXA phase coating for superior resolution and color fidelity with silver metallic prism coating for enhanced light transmission and brightness CONVENIENCE - Twist up eye cups, Light weight, ergonomic styling, roof prism design, Rubber armoring for comfort, protection and durability, Soft rubber rain guard, nylon case, wide neck strap, Lens Covers and Cleaning Cloth GUARANTEE - Alpens No-Fault, No-Problem Lifetime Warranty. If for any reason whatsoever if you have a problem with your Alpen product just return it to Alpen and it will be repaired or replaced and returned to you free of charge.