Designed to deliver power and performance, the Vortex Optics 10x42 Diamondback HD Binoculars is an ideal optic for hunters, birders, and outdoor enthusiasts who glass at all ranges and require accurate colors with crisp clarity in all light conditions. To withstand the rigors of daily outdoor use, the optical tubes are argon-filled and O-ring sealed to be waterproof and resistant to internal fogging if the weather turns or the binoculars take an accidental spill in a creek or puddle.