The SERENE UC-1625QB adult combo includes a UM-16 Serene mask and a USP-250 snorkel. The UM-16 Serene mask gently conforms to the contours of your face. Constructed with crystal silicone, the Serene has been crafted for divers who want a wide field of view combined with a low volume design. The USP-250 dry snorkel features TUSA Hyperdry Elite dry top technology (pat p) that stops water from entering into the snorkel, a drain chamber and purge valve for easy clearing, and hypo-allergenic crystal silicone swivel and mouthpiece.