Cressi Adult Mono-lens Snorkeling Diving Mask | Onda: made in Italy Cressi is a REAL diving, snorkeling and swimming Italian brand, since 1946. This mask has a Single Tempered Glass Lens, and is designed for Snorkeling, Swimming and Scuba Diving. The skirt is made from soft hypoallergenic transparent Silicone. Excellent seal on many face types, average internal volume. The visibility provided by the Single Lens and the unusual shape of the frame extends in all directions. Quick-release strap buckles.