Cressi Nano Crystal Mask Snorkel Set (Made In Italy) Designed for Scuba Diving, Snorkeling, Advanced Free-Diving and Spear-Fishing Extremely Hydrodynamic and Compact Shape Swiveling Micrometric Easy Adjust Buckles Double Feathered Edge Crystal Silicone Skirt Generous Bore Contoured Tube Provides Ample Airflow