Effectively reduces reflected light and increases the transmission of light giving you a brighter image than normal single coated lenses.Dont let unexpected showers stop you. While not submersible, rainproof optics will shed water in the harshest conditions, so you can push forward.Nitrogen gas is used to purge air from the optic to help maintain internal fog-proof and waterproof capabilities.WARNING: Cancer and Reproductive Harm -www.P65Warnings.ca.gov