Cressi Nano black HD mask Mask for advanced freediving and spearfishing, designed to offer an extremely hydrodynamic and compact shape to help divers cut through the water and aid movements in small spaces. The internal volume is minimal and does not require intentional equalizing. The swiveling buckles feature micrometric regulation. Angled tempered glass lenses. Anatomical strap. Video : https://www. youtube. com/watch?v=ga1gqZaql24