Please feel free to contact us if you have any problems or questions, we will reply you ASAP.Choose Size:With your mouth closed, measure the distance between the bridge of your nose and the bottom of your chin:-If it measures more than 4.7inches (12cm), choose size L/XL-If it measures less than 4.7 inches (12cm), choose size S/M-If there is a kid(4-11ys),choose size XS/SCheck Seal:1 Make sure there is no sand in the mask or tube, you can rinse mask with water before using it.2 Check the fit of mask after wearing it. If the size is not suitable,please contact our customer service.3 Breath normally to check for leaks, you have a good seal if you feel light pressure when breathing, if not, adjust the mask wire size or adjust the direction of the face.In the Water:Once snorkeling in the water, breathe peacefully with your mouth or nose.If you feel dizzy, in order to create the best breath, remove the mask immediately and keep your chin lifted slightly.If you feel respiratory disorder, don't worry. The snorkel is temporarily covered by water and the dry top design will prevent water from entering at the top.If water infiltrates your mask and simply lifts the head out of the water, it will discharge the chin of the valve and remove the water without removing the mask.Caution:This snorkel mask is not intended for use in free diving, scuba diving or strenuous swimming,please follow the instructions.Children and non-swimmers need to be properly used under the supervision of adults.Surface snorkeling, not free diving. You'd better don't go more than 8 feet in order to keep the balance of pressure. Men need to shave their beard to have a better seal,as is any full face snorkel mask.Package Including:1x Zeeshy Full Face Snorkel Mask1x Snorkel Mask User manual1x Waterproof Phone Case
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