The Engage Binoculars features ED Prime Glass- Bushnell’s highest quality glass delivers amazing color, resolution and contrast, even in low-light conditions, Exclusive EXO Barrier Protection- Bushnell’s protective lens coating molecularly bonds to the glass, repelling water, oil, dust, debris and preventing scratches, Dielectric Prism Coating - Applied to the prisms, it ensures vivid color reproduction and allows 92 percent light transmission for bright images and PC-3 Phase Coating, Applied to the prisms, it enhances resolution and contrast.