Lens material: 4mm thick tempered glassMask material: PVCHeadband: TPR materialSteel ring: stainless steel frameTempered-Glass Lens for Safety: Forget flimsy plastic lenses This one is quality tempered glass, which resists scratching and shattering.Convenient Buckle for Easy Adjustment: Simply pull the straps to desired fit and the buckle will hold the straps securely in place. Presto: customized comfort.Rugged Enough for Scuba Diving: Thanks to its sturdy construction, your mask can stand up to all kinds of wear - from snorkeling in the pool to deep-sea scuba diving.One-Piece Lens: A snorkel mask should help you see better, not obstruct part of your view. Now you can enjoy all the underwater scenery clearly. Our products are made with the highest quality materials and are designed to provide you with the best possible user experience. We strive to ship out all orders within three days of purchase, and the estimated delivery time is 8-25495 days. When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it!