Nikon's Action Ex All Terrain Binoculars - are designed to appeal to optics users who value tough construction and reliable optical performance under even the most extreme conditions. Nikon Extreme binoculars feature an all-metal chassis with lens fittings housed in a tough, lightweight polycarbonate body shell. Like all Nikon All Terrain Binoculars, the Ex is nitrogen-filled and O-ring sealed for total waterproof, fogproof and shockproof performance in any environment.