The Nano is for advanced divers, freediving, and spearfishing lovers, designed to offer an extremely hydrodynamic and compact shape to help divers cut through the water and aid movements in small spaces. To develop the Nano mask, Cressi invented and patented the Integrated Dual Frame Technology System. The IDF Technology consists of the joining of two rigid frames, the first on the rear of the silicone skirt, and the second, anterior to the first one, that supports the lenses. When the two frames are joined and locked together, the silicone skirt remains locked in the middle to guarantee a perfect seal between the facepiece and the lens. This technology produces a drastic reduction in the internal volume while keeping the lenses close to the eyes to ensure a wide view, laterally and in the lower zone. The result is a mask with an extremely hydrodynamic shape and low volume. It is the mask on the market with the lowest internal volume (12.86 in3 | 83 cm3), an ideal requirement for freediving lovers. The completely flexible, virtually indestructible buckle is a Cressi patented system (US 8281471 B2). It does not require intentional equalizing. The swiveling buckles feature micrometric regulation. Mask features inclined and inverted tear-drop lenses to improve downward visibility, a Cressi's patented design (US 6272693). An anatomical strap ensures a perfect seal on the head. The Nano is available also in Crystal Silicone®. It is an exclusive Cressi material that revolutionizes mask skirt clarity. It offers incredibly clear vision and features long-lasting advanced technology components within the pure silicone skirt which prevents premature discoloration, reduces fogging, and guarantees many years of Crystal clear viewing..