shouldbuy Swimming Studying Goggles Diving Mask Snorkel Set (for Age 3-11) Efficient anti-fog Unobscured;Low resistance;Comfort mirror ring;Adjustable nose Strips of silicone adjustable and double can cling to head more firmly Length: about 40cm/16"; Mirror Width:about 14cm/5.5" Material:PC+Polycarbonate+Silica gel