PROSTAFF P7 binoculars incorporate superior Nikon optics and lens coatings for a high-quality viewing experience; Nikon's Phase-Correction coating is applied to the roof prisms for increased definition and clarity; Nikon's dielectric high-reflective multilayer prism coating maximizes light transmission across the visible range; An oil and water repellent coating is applied to both the objective and eyepiece lenses; Whether you're spotting birds near the water's edge or caught in inclement weather, you won't have to worry about PROSTAFF P7 binoculars; Even going from a warm car to the cold winter air won't fog the lenses on PROSTAFF P7 binoculars; The glass used in the PROSTAFF P7 binoculars is lead-free and arsenic-free; Lightweight, comfortable and tough