???Tempered-Glass Lens for Safety?Seago swim mask chooses the ultra clear thickened tempered glass with a safety film to withstand deep water pressure for all types of diving or swimming. Scratching resist lens provides the clearer view under water.Seago kids diving mask is with thick tempered glass lens, but please Don't toss them down on the tile floor, Don't jump into water with the mask, Don't scratch the glass with sharp objects. | ???180!noramic View and Anti-fog?Advanced lens shape design and thickened tempered glass with latest anti-fog treatment means you'll have a crystal clear underwater experience without blurring or distortion. One piece glass design enables better and wider vision under water. | ???Soft Nose Cover?Seago swimming goggles is with soft silicone nose cover, which is needed to compensate for increasing pressure as kids swimming, snorkeling or diving. Also it's helpful for kids who do not know how to stop breathing by nose underwater. Perfect for snorkeling and recreational swimming. | ???Soft Silicone Rubber?Leak proof, comfort seal skirt and strap adopt soft silicone, which molds to the shape of your face for comfortable fit and watertight seal. No more leak or discomfort. Soft liquid silicone face skirt comfortably fits a wide variety of boys and girls, reduces face water pressure, seals on kids' face well without worrying about water leakage when scuba diving snorkeling or swimming. | ???Easy headstrap adjustment of snorkeling masks?Seago water mask fit a range of 5-15 years old children' faces. The straps of scuba diving mask 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. Tips to avoid the leakage: Tighten the mask and you can feel that the silicone skirt is fully absorbed on your face.