Non-slip rubber armor - Protects binoculars from impact and provides sure grip in damp marine environments. PermaFocus Technology - Keeps distant objects permanently in focus, eliminating the need for constant adjustment. Nitrogen Purged Fog-Proofing - Nitrogen inside the scope ensures interior optical surfaces won't fog due to humidity or rapid temperature change. Multi Coated Optics - Multiple layers of coatings on all lens surfaces increase light transmission and image brightness. Bushnell Spectator Sport 10x50mm Black Binoculars BS11050