The Viper Semi-Dry Double Purge is a semi dry snorkel that features a unique double-purge design (one purge above the mouthpiece and one purge at the bottom of the barrel) that forces water to exit, resulting in easier clearing and more comfortable breathing. The Viper Semi-Dry Double Purge snorkel also features a flexible lower barrel for comfortable positioning, contoured barrel to reduce water resistance while swimming underwater, an interchangeable silicone mouthpiece and quick release mask strap retaining clip.