Anti-fog -- Separate breathing chamber design effectively stops the mask from fogging up by a dual air flow system, Enjoy a crystal-clear viewing experience. 180 Panoramic -- Snorkel mask provides you a breakage-proof safety window with 186 wide viewing give you a full view scenery under the sea. Full-face -- Snorkeling mask takes away the inconvenience of holding the snorkel in your mouth, allowing you to breathe naturally through your nose and mouth underwater. More comfortabel -- Quick-adjust ratcheting mask strap buckles and soft high-quality silicone rubber skirt,give more comfortable experience when you skin diving. Delivery Quantity: 1pcs Product color: black Product size: inner diameter 19*13CM, outer diameter 23*19CM