1. Separate inhalation and exhalation channels prevent lens fogging and seal the mask without worrying about water leaks. And the pipe will not be immersed in water when the head is rotated. Even if the waves hit, the valve keeps water out. 2. The diving mask not only adjusts the elastic band to fit the face, also improves the half face swimming snorkel mask. It is suitable for different face shapes and can be used by children over 6 years . 3. The diving mask has clear lenses with a 180-degree panoramic , giving you the fullest field of vision for an impressive diving experience. 4. Detachable, collapsible snorkel with ventilation on top for breathing and air intake for snorkeling with . Great for experienced swimmers and beginners. 5. Beginner-friendly, the diving mask can also be equipped with a detachable action camera mount for hands-free underwater. It is also the perfect gift for family and . Use this swimming surface Colour:black Material:Silica gel Size:13.5 x 11cm Package Contents: 1 x Snorkel Mask Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.