Tusa SPORT UC3325 Imprex 3D Dry Adult Mask and Snorkel Set includes a single window mask that incorporates 2 side windows for enhanced panoramic and peripheral vision. TUSA's patented Hyperdry nose purge system which allows for easy no nonsense clearing of the mask with a single exhalation. The dry snorkel features TUSA Hyperdry Elite dry top technology that stops water from entering into the snorkel.