AFTER SALES SERVICE- As long as you are our customers,since the day you buy full face snorkel mask,we will provide 24-hour uninterrupted service.We sincerely believe we will bring our customers the most satisfied buying experience. 180PANORAMIC VIEW- Different from traditional snorkel mask, the full face design allows you to breathe comfortably through your mouth or nose while snorkeling,unencumbered.The flattened large lens reduces underwater distortion for the best viewing experiences. FREE BREATHING DRY TOP SYSTEM- Featuring three completely separate air channels to maximize airflow and help ensure the mask stays fog-free,also stop salt water from getting into your mouth and prevents gagging. ANTI-FOG&ANTI-LEAK- It offers superior comfort with a hypoallergenic silicone skirt that creates a leak-free seal around your face.The separate breathing chamber inside the mask isolates the air that from the nose and mouth,so that the heat air is not easy to condense on the mirror surface. ENHANCED FUNCTIONS- Featuring a foldable snorkel tube for better packing,and no more worry about falling-off problem of the snorkel.Additional removable camera mount enables you to install camera and records your fantastic underwater adventures.In a word,this snorkel mask has everything the modern swimmer needs to enjoy the snorkeling. Preparation: Make sure there is no sand on the mask or tube,if there has sand,using water to clear the breathing tube or mask,once the mask is clean then it ready for use. Checking the seal: Pull the straps of the mask over your head and check the fit of the mask on your face,breath normally to check for any leaks,if you feel slight pressure change when you breath,then you have a good seal,if not,please kindly adjust the mask wire size. Using: Once in the water,swim on the surface and breathe calmly through your mouth or nose,if you feel light headed remove the mask immediately,keeping your chin slightly up will create the best breathing experience,if you feel any obstruction to your breathing,it may be due to the snorkel being covered in water temporarily,the dry top snorkel design will prevent water from entering through the top of the snorkel,if water leaks into your mask,simply lift your head out of the water and it will drain out of the chin valve,no need emove your mask to clear it of water. Why Choose Us: The Greatever Foldable Snorkeling Mask effectively solves the problems of the non foldable snorkeling mask: the non foldable one is not easy to install,and the breathing tube is easy to fall off when it is used; after several times of use,it is necessary to replace its accessories (O type seal ring).The Greatever Foldable Snorkeling Mask is easy to install,and its breathing tube will not fall off.There is no need to replace any accessories,and the mask has a longer service life.