ANGGO Adult Anti-fog Dive Mask for Swimming Diving Widely Used: Dive Mask for Swimming /Diving/ Snorkel. Comfortable Wear: Soft mask with 100% silicone skirt enables you feel fit. With Anti-Fog Film: Avoid fog appear on the inside lens with an exhalation from nose, making you see clear under water. Tempered Glass Lenses: 3.5mm thickness of tempered glass makes it strong enough for the pressure of water. One Size Fit All: Adjustable head straps and a high-grade soft silicon face skirt fit virtually any face shape. The ribbed design provides extra support and ensures a water-tight seal.