180 Full Face Design: Mask internal hemispherical, 180 degree arc wide field of vision, broad without blind spots, open up a whole new world of underwater adventure. Outfitted with comfortable silicon face padding, and easily adjustable elastic nylon straps, more comfortable.Physical Anti-Fog Principle: The principle of exhaust fan design, by altering the air flow of inspiratory breath effectively physical anti-fog, helps eliminates fogging and will keep you snorkeling longer, get rid of discomfort, more hygienic.Easy Breath Freely: Combined with masks and breathing tubes, allows you breathe through mouth or nose while snorkeling. Break the respiratory limitation of traditional diving mirrors. The size S/M is for children and teenagers, L/XL is for adults.No Leakage: The mask adopts ultra soft food grade silica gel, ergonomic design better fits face without breathing tubes. Dry dop system can automatically close the top valve to prevent water inflowing after entering water.Camera Can Be Placed: Through integrated action cameras, you can easily connect your camera to record the different scenery you see under the water, suitable for swimming, diving, and other underwater activities.The distance from eyes to chin is 10-12CM, choose size: S/MDistance from eyes to chin: greater than 12CM, size selection: L/XL