ow to choose the size? Firstly,Measure the length from the Eye to Chin. If the length less than 12 cm ,Choose size S/M. (Suitable for The Junior and Adult Woman) If the length equal with or over 12 cm,Choose size L/XL(Suitable for Adult Men) Specification: Mask material: Polycarbonate shatterproof PVC Lining material: Medical liquid silicone Color: Sky Blue, Dark Green,Black Red Size: S/M: Inner diameter 17x13cm/6.69x5.12in, outer diameter 23x19cm/9.06x7.48in L/XL: Inner diameter 19x13cm/7.48x5.12in, outer diameter Color: White,Black,Blue,Green,Pink,olive green black, light blue,dark blue,black&red Size: S/M, L/XL PRODUCT ADVANTAGES： 180°FULL FACE DESIGN: Our snorkel mask provides 180º Panoramic view, makes it easier than ever to breathe comfortably through your mouth or nose while you are snorkeling. you will see more fish and undersea world than ever before! With a detachable for camera mount you can easily connect your camera and capture the movement around you in hands-free high-definition. COMFORTABLE TO WEAR: be made of hard PC, snorkel mask adult anti fog is non-toxic and odourless; wrapped by soft and thick silicone, it protects your safety and won’t make you headache for longtime wearing; free breath and no need to hold a breathing tube in your mouth and clinch your jaw the entire time. EASY BTEATH & ANTI-FOG DESIGN:Unigear Full face snorkel mask allows user breathe through mouth or nose while snorkeling with no mouthpiece. With snorkel tube allow you to diving deeper.Separate inhaling and exhaling channels that creates an airflow away from your main viewing Vision that helps eliminates fogging and will keep you snorkeling longer. DRY SNORKEL TECHNOLOGY:A ball at the top of the tube will automatically seal the air valve to stops salt water from getting into your mouth and prevents gagging, Spend less time worrying about water in your mask and more time snorkeling. 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 poor 4. 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. Maintenance Clean 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.