From the Manufacturer:
These premium binoculars of the BRESSER Pirsch series is the ideal model for a range of activities as well as observations in the twilight.
The binoculars are armed with the newest phase coating enabling the image to be more clear in contrast and high-definition, this is reinforced by fully-multicoated lenses. The BaK-4 glass material enables you get a bright and clear picture. The TwistUp eyecups enable spectacle wearers to also enjoy the full field of view, they are adjustable in 2 steps and also support non spectacle wearers. The BRESSER Pirsch Binoculars have a rubber armored body for solid grip. All Pirsch models are armed with a broad and very comfortable neckstrap. To make the package complete these binoculars are waterproof and nitrogen purged to prevent them against fogging.