Alpen Optics WINGS ED HD 10x25 Compact Waterproof Fogproof, BaK4, Fully Multi Coated Roof Prism Binocular TECHNOLOGY - ED - HD (Extra Low Dispersion and High Defination Optics) with BAK4 glass provides clear, bright, high resolution images with fully multi coated lenses for maximum brightness CONSTRUCTION - Waterproof, sealed and nitrogen filled LENS COATINGS - PXA phase coating for superior resolution and color fidelity with HR metallic prism coating for enhanced light transmission and brightness CONVENIENCE - Compact pocket size binocular. twist lock eye cups. light weight, ergonomic styling. roof prism design. Rubber armoring for comfort, shock protection and durability. Nylon case and comfortable 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.