The Cressi Nano Mask has been designed to have a minimal internal volume with the structure of a framed mask. Hydrodynamic shaping reduces drag and the swiveling buckles aid the anatomic strap from holding the mask on comfortably. Low VolumeThe Nano lives up to its name and has such a small internal volume that on many dives you won't feel much of a squeeze and need to equalise. The lenses are angled to give you a better view and because they are closer to your eyes than traditional masks you have a wider POV.