Bushnell Legend Porro Prism 8 x 42 Binocular BaK-4 porro prisms, Fully multi-coated optics allow maximum light transmission for optimum brightness Heavy-duty, 100% waterproof/fogproof construction, Rainguard Pop-up eyecups on compacts, Large center focus knob for precise focusing even when wearing gloves Trim, ergonomic shape for easy, all-day use, Textured, non-glare, non-slip rubber armor absorbs shock Diopter adjustment for precise and reliable adjustments