Features 1. NEW Design Double Air-flow Channels for Easy Breathing, inhaling and exhaling separate channels structure, assure there is enough oxygen stay in the mask and the carbon dioxide would flow out separately, allow you to breathe easily through nose or mouth under the water 2. 180° FULL FACE DESIGN - 180° Large viewing area lets you enjoy undistorted visibility and see breathtaking sights under the water clearly.With detachable GoPro Mount,can easily connect your camera to capture the movement around you in hands-free 3. ANTI-FOG & ANTI LEAK DESIGN: Our innovative anti-fog coating designs ensures the anti-fog effects up to 15,000 hours while the silicone fits your face snugly but softly to guarantees full water resistance, make sure you have a safe snorkeling experience 4. DRY TOP SYSTEMS: Dual tube with air valve allows holding your breath longer, breathe dry, would lock air inlet automatically when water entering 5. Adjustable mask: Adjustable Head Straps and 360° adjustable respiratory systems, make you enjoy a comfortable and safe snorkeling trip. Easy to use,just install the breathe tubes,camera holder and tear off the protective film before the mask, then slip the snorkel mask to your face, adjust the soft fabric straps, and you're good to go. Great for snorkelers of all skill levels Easy to Breathe,feel free to breathe naturally through your nose or through your mouth with the snorkel mask. Once the mask is on, you don't even have to think about your breathing - simply enjoy the sea! 180° Panoramic Full View Sea Dive Mask with Dry Top, All of these masks give you a perfect 180-degree field of view with a fog-free lens. A silicone seal applied to the edges of the best dry snorkel mask locks in the air & locks out water. No more seepage or leakage! PROPER USE The full face snorkeling mask is specially designed for leisure snorkeling. It is only suitable for surface snorkeling and is not meant to replace any professional snorkel set and diving equipment. When snorkeling, you must rest regularly and follow the rules of partners: never snorkel alone. Before you go snorkeling, try it in the swimming pool to make sure it is completely sealed and fits your face. HOW TO CHOOSE SIZE ? If you are over than 4.7 inches (12cm), recommend L/XL size Specs: Category : Diving Masks Materials : Liquid Silicone PC Color: Yellow Activity Diving / Snorkeling Features For Cellphone, Waterproof Size : L/XL for Adults Number of Dive Mask Windows Single Window Gender Unisex PACKAGE INCLUDE: 1 * face mask 1 * breathing tube 2 * earplugs 1 * nut 1 spare waterproof ring 1 instruction manual