Adjustable Swimming Goggles with Anti Fog Technology Suitable for Adults with Premium Google Case Anti-Fog Polycarbonate Lenses: provide superior protection from harmful ultraviolet rays. Great Density Silicon Rubber Strap: The head strap is made of 100% soft and elastic silicon, comfortable to wear, as well as prevent eyeglass from slipping during swimming. Sophisticated Buckles: the adjustable side buckles offers different size options within easy reach. Double nose adjusters and Double earplugs: High hardness materials have been used and can't be broken. Ergonomic completely sealed silicone protective circle design can help to reduce the pressure around the eyes and let you enjoy swimming.