The Poseidon Mask 3D is a new ultralight two-lensed mask exclusive to Poseidon. A low volume mask that fits most faces, new ultralight two-lensed mask exclusive to Poseidon.  It's strong and easily adjustable side buckles that swivel 45 degrees and a robust frame with optical lenses. Additional optical lenses are available from -1.5 to -­9.0.