Cressi Single Lens Frameless Scuba Mask & Dry Snorkel for Snorkeling, Scuba Diving, F-Dual & Supernova Dry: Designed in ItalyThe a1 has been designed with an attractive style, it boasting high performance for scuba diving and freediving. it features a single lens made of tempered glass lens having special treatment that makes it completely anti fog! The lenses are inclined and they have an inverted teardrop shape, increasing the downwards visibility. this allows better control of the scuba diving equipment. The skirt and the strap are made of a soft silicone ensuring a high