Specification Material: Polycarbonate Shatterproof Mask Lining material: imported medical liquid silicone. Sports camera base：Fits for Gopro and other sports cams. Product size:internal diameter 19 * 13CM, external diameter 23 * 19CM Uses: diving, swimming, snorkeling and other underwater activities. SIZE: Your mouth closes and measures the distance between the bridge of the nose and the chin: If the measured value is less than 4.7 in (12 cm), select the size S / M If the measurement is more than 4.7 in (12cm), select the size L / XL Package Included: 1X Diving Mask 1X Breathing Tube 1XEnglish Manual Mounting Accessories Precautions 1. Clean the mask with a clean liquid 2. Place the mask on the face and adjust the elastic band that matches the face. Once the mask is tightened,just pull the belt again until both your face and full face mask are silicone insert. 3. Wash the mask with water to keep it clean and dry the mask for the next use 4. Mask can not be used for deep diving or intensive swimming.All the similar masks on the market are the same. If our product does not meet your expectations in any way, you can return it within 30 days of purchase to get a full refund. no problem. Your satisfaction is our top priority.
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