A Fogging Mask can really ruin a dive! Always use a Quality Mask Defogger that has been especially developed for Defogging and is versatile. Apply a small drop on your mask lens lightly rub it over the lens and you will have hours of fog free diving or snorkeling vision. AKONA Anti-Fog Gel is also great for glasses, sunglasses, snow and swim goggles. Whatever your sport need if the Lens Fogs you need AKONA Anti-Fog Gel. The Anti-Fog Gel comes in a convenient Squeeze Drop Plastic Applicator and contains 1 oz (30 ml) of Gel.