What you should know before buying a full face snorkeling mask? What are the current problems with most snorkeling masks: 1,Size problem, the exact size is hard to select S, L or XL? it is diffcult to choose the right one. 2,Not well sealed, leaking. 3,The mask always fogs up. 4,Hard breathing How to solve the problem? ORSEN team has developed a unique design that solves all problems! Solution to the 1st problem: According to European face customization, as long as you choose the size according to our size chart, we can guarantee that you will choose the right size. We recommend that men choose L/XL, women and children over 12 years old choose S/M. Solution to the 2nd problem: No leaking,one-piece molding with airbag design, softer and more comfortable. Fits almost all face shape. WATER IN THE MASK, NEVER AGAIN ! Solution to the 3rd problem: No fogging up! Unique and independent breathing tubes. Solution to the 4th problem: Larger breathing tube with dual airflow technology, so you can snorkel easily in the water and on land. What advantages for our products? Separate inhalation and expiration design for greater safety Clear 180 degree panoramic view Camera mount is suitable for any kind of action cam. Adjustable elastic bands Free breathing through the nose or mouth 100% dry breathing tube Built-in earplugs WHAT’S IN PACKAGE: 1 x ORSEN Snorkeling mask 1 x User manual in English