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How to choose the size?Firstly,Measure the length from the Eye to Chin. If the length less than 13.5 cm ,Choose size S/M. (Suitable for The Junior and Adult Woman) If the length equal with or over 13.5 cm,Choose size L/XL(Suitable for Adult Men)FAQ:1. Does this diving mask have requirements for the water temperature of the environment in which it is used?Answer: We suggest that user is better wear the mask in Temperature 18~45'C water. It will be a little fog if the temperature is more Than 40'C, If the fog is severe, please make Sure the mask is wore properly.2. Is there any age limit for users of this product?Answer: Don't use for the baby or kid less than 36 months, It will lead choking.3. How deep can I dive with this diving mask?Answer: Our snorkel mask is designed for surface snorkeling. This is for snorkeling only. Practice in the shallow beach or swimming poor4. Will it fog up when wearing it?Answer: The anti-fogging principle of this diving mask is to create a good confined space through the good contact between the nose and the mask to achieve the anti-fogging effect. If you wear it, the area around your nose is close to the mask and has good airtightness,this type of mask can have some anti-fogging effects, and you can also wipe it with an anti-fog spray on the mask before use.Make sure the O'ring is on the groove of mask Connection part. It will avoid leaking problem. Please adjust elastic band well to avoid no leaking Especially chin and forehead part.MaintenanceClean mask with fresh water after use every time. Put the mask in warm fresh water for some minutes After sea snorkel to avoid corrosion. Avoid to use soap or detergents to make visibility well. Keep dry after use. Don't place the mask under the sunlight directly. Don't use towel to clean the face lens, glasses cloth Is better. Don't place face lens touch the hard surface.