Cressi Nano Black HD Mirror Lenses Mask for spearfishing and freediving. The ultra low internal volume and integrated frame/skirt construction put the Cressi Nano mask in the modern Micromask category with the Aqualung Technisub Micromask, Speardiver Micromask, OMER Zero, and Sporasub Piranha masks. Incorporating angled tempered glass lenses this compact mask offers excellent field of vision. The Cressi Nano frame combines old school smooth curves with a modern twist, resulting in a stylish appearance. The Cressi Nano mask skirt is very soft providing excellent coverage and seal, with no leak under the nose even when making the facial gestures. Our experience has been that the Cressi Nano mask fits a wider range of faces than other ultra low volume masks.