"Leupold BX-3 Alpine HD Binoculars are designed around the proven Elite Optical System to maximize light transmission, enhance edge-to-edge clarity, and provide a wider field of view. So you see brighter images in low light conditions along with sharper image quality whether you're glassing dense timber or rolling hillsides. High-definition lenses are coated with Guard-ion hydrophobic lens coating that sheds dirt and water for a crisp, clear image in any weather. The BX-3 Alpine's redesigned magnesium chassis with rubber armor keeps weight down while providing robust durability and easy handling characteristics. Interchangeable form-fit eyecups provide comfortable viewing. Like all Leupold Binoculars, the BX-3 Alpine HD is waterproof, fogproof, and guaranteed for life. The 1/4""-20 adapter port allows tripod mounts to be installed for use with a tripod (adapter not included). Elite Optical System with high-definition lenses Guard-ion lens coating sheds dirt and water Rugged-yet-lightweight magnesium chassis Rubber armor for added protection 100% waterproof and fogproof Backed by Leupold's lifetime guarantee"