This mask has a particular tapered structure patented: IDF-INTEGRATED DUAL FRAME TECHNOLOGY SYSTEM.
NANO enjoys of technical advantages that Cressi has been incorporating in recent seasons in various models.
IDF-INTEGRATED DUAL FRAME TECHNOLOGY SYSTEM
The glass/face distance has been reduced.
The buckles anchored in the frame for optimum mask stability.
This type of anchorage also improves the stability of the mask.
U.S. PAT 6272693 B1
INTEGRATED DUAL FRAME
ULTRA LOW VOLUME
MICROMETRIC ADJUSTABLE BUCKLE