DOUBLE-TUBE FULL FACE SNORKEL MASK Lately, The upgraded double-tube full face snorke mask for surface snorkeling have met unprecedented success on the beaches all over the world and have made the beauty of snorkeling accessible to everybody. Do you want to try it? Size Measure from the bridge of your nose to chin, If less than 4.7in(12cm) and please select size S/M,if more than 4.7in(12cm) and please select size L/XL.Generally,S/M is for women and teenagers(Also applies to older kids),L/XL is for men.See the size. Operation Instruction: 1.Inserting the tube into the mask in order 2.Put on the snorkel mask and make sure the silicone waterproof sealing edge fits your face no gaps. 3. Adjust the elasticated straps to the appropriate length,make your face fit perfectly with the mask. How to save ? 1.After every usage, apply the dish soap or liquid soap to the outer shell and inner of the mask, soak it in clean water for 10 minutes to avoid corrosion. Then pick up and clean with fresh water. 2 .To keep better anti-fogging effect,pls don't wipe the mask. Just leave it dry naturally after cleaning to avoid direct sunlight. 3.Avoid letting your mask come into contact with sand.Sand will scratch your mask window and can also clog up the floater in the snorkel gear. Precautions: 1. Designed for surface snorkeling(less than 3m/10feet) purpose only. 2.Do not wear it to scuba diving ,deep diving , and free diving. 3.Any hair or beards create micro-spaces that allow water to leak in. 4.Be sure to take regular breaks while snorkeling. Also follow the buddy rule: never snorkel alone. Package Included: 1 x Snorkel Mask 2 x Breathing Tube 1 x Mesh Bag 1 x User Manual