The Seaview 180 SV2 Full-Face Snorkel Mask is a high-performance full-face snorkel mask, designed to have a comfortable fit, as well as improved breathability and visibility. This unique mask also features a wide-angle lens for crystal clear 180º views. The Seaview 180 has another feature that sets it apart from other snorkel masks: a patent-pending Flowtech system that provides natural breathing through both your nose and mouth. Using two chambers and 4 intake valves, this system will deliver more fresh airflow and better circulation, which means less fogging, better visibility as well as easier breathing.