Tempered Glass For Deeper This diving goggles choose the ultra-clear thickened tempered glass to withstand deep water pressure for all types of diving or swimming. The lens is strengthened with polycarbonate to increase the impact resistance and its anti-fall performance is higher than toughened glass, scratching resist lens provides a clearer view underwater.Anti-Fog & Anti-UV Lens Fog-up? No The inner surface of the goggles has an anti-fog coating, stops the lenses from becoming steamy underwater and allows you to focus on swimming. UV resistance can better protect your face from sun rays. (Note: Do not touch the lenses inside the surface by hands or any sharp tools, or it will damage the anti-fog and anti-UV function.)Soft Silicone Prevent Leaking Leaking? No Wider flexible food-grade silicone skirt and comfortable nose cover for the best possible fit. Ergonomic design with 3D frame and an adjustable elastic silicone strap to fit snugly and the improved scuba diving mask fit different face shapes well, seals on kids' face perfectly without worrying about water leakage when scuba diving snorkeling or swimming.Easy Headstrap Adjustment Fits Most Kids Comes with an adjustable elastic silicone strap which can be adjusted by easily pressing masks' button buckle and the buckle will hold the strap securely in place without creeping down in the water. (Note: this model might be too big for some of the small kids. Please be sure to measure the kid's face before purchase.)Enjoy Panoramic Vision UnderwaterEnjoy maximum under-water visibility. One-piece glass design and anti-fog treatment lens enables a better and wider vision underwater. you can focus on creating underwater adventures with this full-coverage mask and have a crystal clear underwater experience. (Please feel free to contact us if you have any issues with this goggle.)