ENHANCED SYSTEM - Upgraded edition has a bigger chamber and 2 intake valves to allow air to circulate in and out freely. The SN01 mask's separate the inhaling and exhaling channel prevent CO2 build up making it easy to breathe and prevent fogging for an extended time period. 180°PANORAMIC VIEW - Updated full-face design provides a larger viewing area, guaranteeing that you will see more fish and sea creatures than ever before. With our detachable camera mount you can easily attach your camera to capture and share your adventure with friends and family. COLLAPSIBLE DESIGN - Comes with a fold-able snorkel tube and a tote-able mesh bag, being convenient to package and take it anywhere you want. With multiple colors and 3 different sizes ( XS, S/M, L/XL ) to choose from you can always find one that fits your face and personality perfectly. PROPER USE - Full face snorkel masks are designed for leisure surface snorkeling. Serious free-diving is not recommended because you cannot equalize. Also follow the buddy rule: never snorkel alone. Become familiar with your gear before you go. Try it in a swimming pool and make sure it fits and seals.