Features: - 180° full face design: mask with toughened mirror provides clear view. Enjoy the beautiful underwater world with a full range of views. - Anti-fog function: double air passage inside the mask. Fan design, anti-fog, easy to breathe, no need for breathing tube. Innovative design with independent breathing chamber, can eliminate fog. And you can stay snorkeling longer. - Dry top system: the air duct itself has a ball inside to prevent water from entering. - Drain valve design: when water enters your respirator mask, lift your head to dehydrate the water.