The Cressi Atom is a frameless mask. The amount of material has been reduced to an absolute minimum. Embedded in the silicone is a rigid core that supports the two lenses and gives the mask just the right amount of rigidity. This semi-rigid core replaces the usual outer plastic frame and has reduced the mask's internal volume. 

Another feature of the Atom is the ergonomic shape of the nose. Two small cavities created by the nostrils facilitate pressure equalisation. This makes the mask extremely stable during the dive. The Atom will not move when you release the pressure with your fingers. The Atom is a great mask for the experienced freediver or underwater hunter who wants maximum performance from their equipment.