HIGH DEFINITION LENS. The lens of our goggles for kids is made of high grade premium materials with strong impact resistance. The transparency is higher than other materials, and it is scratch-resistant and, it could help your children see crystal clearly underwater. ANTI FOG. The inner surface of our kids swimming goggles for boys and girls lens has been treated with anti-fogging, so it will not produce fog when used in water for a long time, making clearer vision. SOFT AND COMFORTABLE FRAME. COOLOO childrens swim goggles are made from non-toxic and odorless soft silicone, which can relieves the pressure on the skin and also create waterproof seal, no leaking. EASY PUT ON AND TAKE OFF.One click open buckle + adjustable clasp make your kids could easy put on and take off the child swimming goggles without getting them tangled in hair.