180 Panoramic HD Diving MaskHigh-volume single lens of this oval dive mask creates a panoramic field of vision while diving and snorkeling without blind spots. Tempered-Glass Lens for SafetyMade of impact-resistant tempered glass, which can withstand the impact of sharp objects and deep water pressure for both clarity and safety. Soft Silicone Oval Scuba MaskLeak proof, comfort seal skirt and strap adopt soft silicone, which molds to the shape of your face for comfortable fit and watertight seal. Easy Headstrap Adjustment of Freediving Mask The straps of scuba diving mask can be adjusted by easily pressing masks' button buckle and the buckle will hold the strap securely in place without creeping down in the water. Multiple ScenesGreat underwater photography mask, a favorite among diving traditionalists. A classic mask for freedivers lovers but ideal also for scuba diving.