The Cressi Nano 2 Window Mask is designed for Advanced Free-Diving and Spear-Fishing. The Mask is 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 Mask is equipped with Cressi"s Swiveling Micrometric Easy Adjust Buckles and has a Wide Anatomical Silicone Rubber Split Style Designed Mask Strap for even dispersion of pressure for increased Fit and Comfort. The Mask has an Easy-to-Reach One-Hand Nose Pocket for Ear Equalization which can be utilized even when wearing thick gloves. The Double Feathered Edge Black Silicone Skirt works in concert with the Split Strap for an Excellent Seal on the Face. Angled Tempered Glass Lenses further Increase the Field of Vision in the Downward-Direction. The Mask is available in All Black, comes with a Protective Mask Box and is covered by a 12 month limited warranty.