WORLD-CLASS OPTICS AND SUPERIOR DURABILITY. With light transmission, clarity and ruggedness as top priorities, we built the ultimate hunting binoculars. Recent upgrades to our XLT series include a new housing that’s even more durable and comfortable to use. Fully multi-coated optics and BaK-4 prisms work together to deliver ultra-bright, razor-sharp images through the most critical periods of game movement. And the tough, streamlined Dura-Grip rubber-armored housing is O-ring sealed and nitrogen purged for 100% waterproof/fogproof dependability. Soft-touch thumb grips further improve handling ease, and the objective lenses are now protected from the elements by flip covers (42mm and 50mm only).