How do I use the goggles?
1. Pass the tape on the left side of the mask through the rubber ring or quick buckle on the breathing tube, so that the breathing tube head can be fixed upward and the breathing tube won't slip down if the mouth is loosened. 
2. The choice of the face mirror: stick the mask on the face (do not let the hair cover inside, this will affect the anti-leakage performance), and then gently inhale the nose, the face mirror can have been sucked in the face is appropriate (the nose can not exhale in this process). Most people don't need to choose a face mirror specifically for their face shape. The width of the face is obviously wider and narrower than that of ordinary people (such as knife face, which is quite common among foreigners). People with very wide faces also need to choose a face mirror with a wide mask, because the relatively wide mask will block the left and right corners of the eyes, which will affect the line of sight. 
3. Matching of the facial mirror: affix the silicone mask of the facial mirror on the face and cover the nose in the mirror; The adhesive tape can be tightened to enhance the clinginess of the mask. After wearing the mask, breathe only through your mouth and do not exhale through your nose. This can cause fog and water to enter the mask. 
4. Hydrops in the face mirror: when you snorkel for a period of time, a little water will accumulate on the nose tip of the face mirror; This is a normal phenomenon, no matter how good the diving surface mirror is, it can not guarantee that the face is completely without water infiltration when diving under water pressure. But if it's more than a little water on the tip of your nose, you're not wearing it. 
5, face mirror fog: people's eyes and nasal cavity is water, some of the water in the snorkeling will turn into water vapor. Because of the temperature difference between the air in the mirror and the sea water, the water vapor will form fog on the glass in the mirror. This affects vision, and snorkeling in complex waters can be dangerous. Usually, you can spit on the glass in the upper mirror before snorkeling. However, from our experience, this effect only lasts for 10 minutes at most. Use a good special anti - fogging agent for several days. 
Note: do not panic even if the fog is serious, and even worse, you can see the general direction, swim back to the shore shallow water or to the boat side to help clear the fog. Of course, skilled snorkelers can pedal their fins in the water to make their head fully out of the water and then remove the mirror to remove the fog and smear saliva.
6. Cleaning the oil film of the face mirror: the new face mirror usually has an oil film to protect it. The existence of this oil film will increase the possibility of fog generation and affect the effectiveness of antifogging agent. At this time can be dipped in toothpaste, and then use a soft cloth gently wipe to remove the oil film.