This is the Seasoft SeaVue Concentrated Anti-Fog Pump Spray for Scuba Mask - 4oz Features: SEAVUE is the only anti-fog egineered to work with ARC (anti-reflective coatings) found on higher end scuba masks. Most anti-fogs are 50 or 60% water, our Seasoft SeaVue Anti-fog is only 33% water with more of the active ingredients that will keep your mask fog free Never rinse off your SeaVue, leave it on after spraying it on the lens for fog free diving SEASOFT&';s SEAVUE Anti-fog Spray is the best anti-fog spray that you will find. There are a few key ingredients that go into an anti-fog spray or gel. Some of them are expensive and some are relatively inexpensive. You can guess which ones a lot of companies cut back on. We want you to know that we never cut back on anything and you can count on us to make it the right way.