1.Adjustable buckle design: the snorkel set contains a fully adjustable headband. The improved button buckle can easily adjust the strap length to fit all head sizes. Advanced silicone face skirts fit almost any face shape and are suitable for both men and women. The snorkelling set is very suitable for professionals and beginners. 2.Dry top antisplash design ensures : the snorkel set installs a disposable inhalation valve and has a movable floating ball at the top. Once the tube is underwater, the tube entrance is closed by the floating ball. This mask has a very soft, liquid silicone coat that seals your face well without worrying about water leakage. Note: Please clean the sand in the tube carefully before using next time 3.180° panoramic view and antileak tempered glass: the snorkel diving mask has a 180° panoramic view made of tempered glass for snorkelling, swimming and diving; enjoy maximum visibility underwater. Advanced lens shape design and tempered glass for a crystal clear underwater experience 4.Food material: diving mask is made of clear food grade silicone, which is soft and comfortable. The soft silicone apron of the snorkel mask adapts perfectly to different face shapes and forms an absolutely tight and very secure closure without worrying about water leaks. It is durable and easy to clean and particularly suitable for longterm use.