The Black Marlin set is ideal for both scuba and snorkelling. The low volume mask with silicone skirt makes a great seal and has a comfortable fit. With easily adjustable clips on the strap, tightening up the mask can be done in a second. The snorkel has a double purge value, an allergy free silicone mouth piece and a good splash guard. It has a drop away flexy tube and a hard plastic mask clip. - Ultimate in frameless technology. - Medical Grade Non-Allergenic Silicone Skirt, the ultimate in comfort and tight seal to prevent water leakage - Ideal for scuba - Non-Allergenic Silicone Skirt, the ultimate in comfort and tight seal to prevent water leakage - Drop away Flexi tube with replaceable mask muscle clip - Twin Purge Valve for fast, easy clearance of water - Splash Guard to reduce water entering the tube - Comfort black soft silicone mouthpiece