P7 binoculars incorporate superior Nikon optics and lens coatings for a high-quality viewing experience; Multilayer lens coatings cut glare and reflection for sharper, clearer views; 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; Often reserved for the highest-end binoculars, the diopter ring locks into place so you can set it and forget it; The glass used in PROSTAFF P7 binoculars is lead-free and arsenic-free; An oil- and water-repellent coating is applied to both the objective and eyepiece lenses; The PROSTAFF P7s are filled with bone-dry nitrogen gas, so even going from a warm car to the cold winter air won't fog the lenses; Although they're not intended for underwater use, the PROSTAFF P7 binoculars can safely be used around splashing water or in inclement weather