Duke is the snorkeling visor that allows you to explore the underwater world from the surface enjoy every moment of the swim. “Duke offers a natural breathing experience due to the absence of any valve (patent pending), and a fog-free vision obtained by the lateral deflector mechanism (patent pending).” “A lateral air channel system, for … Continue reading "Cressi Adult Snorkeling Full Face Mask | Wide Clear View, Anti-Fog System | Easy Breathing: Safety First | New 2019 | Duke Dry: designed in Italy: Quality Since 1946 Review"