Thank You Very Much for Choosing Our FEELING MALL Diving MaskTips:Avoid contact with sand. If the interface between the breathing tube and the mask is stained with sand, it needs to be washed with water before use.When installing the breathing tube, you hear a "click" to indicate that the breathing tube is installed correctly.Arrange your hair and beard before wearing it so that it does not get caught between the mask and your skin.Adjust the straps after wearing so that the mask fits the face firmly.Recommended for 12+ years of age kids and adult.PRODUCT DETAILS:INFORMATIONName: Full Face Snorkel MaskColor: Blue/PinkSize: S/M and L/XLMaterial:Frame (Silicone)Lens (Polycarbonate-PC)Valve port (ABS resin)