Whale an-ti Fog Dive Mask Scuba Diving Goggles,Waterproof and Quick Adjustable Snorkeling Masks for Men & Women High quality silicone skirt and quick adjustable strap,flexible Silicone for leek-proof, comfort seal Easy Adjust Buckle,100% Liquid silicone Strap and Seal Anti-fog and Scratch resistant coating Lens ,feel more free in diving Designed to fit a wide range of facial profile with comfort The glass lenses offer unobstructed and crystal-clear vision for up-and-down