Kids Silicone Scuba Swimming Swim Diving Mask Snorkel Glasses Set Anti Fog Goggles (Violet) Professional diving device, suitable for adolescents Childrenfor 4 to 9 year old Transparent tempered glass lens, anti fog and resistant to break Strips of silicone adjustable and double can cling to head more firmlythere is a white buckle on both sides of the mask to fix the strap, when open the white buckle,the strap can be adjusted, when close the buckle,the strap will be fixed. Leave the silicone waterproof in 3D can ideally correspond with face. The nozzle silicone non-toxic and bleed valve provide comfort at the same time, helping the excess water escaping when expire