I do not know if I'm just too stupid or it is not possible with these goggles? Have you -beschlägt me put dry, moistened with water inside - fogs, moistened with spit inside - fogged. Unfortunately, the view is reduced so significantly under water when the diving mask is constantly fogged. Sealing it holds but also good if you do not just let a few hairs penetrate under the rubber gets the water. Snorkeling is OK, can be good blow when you come back to the surface and you do not need huge force in the lungs to create the.