TUSA Sport Liberator Mask and Snorkel Combo Can be outfitted with corrective lenses for distance Hypoallergenic Crystal Silicone Skirt and Strap EZ adjust buckle technology Hyperdry Technology reduces waterflow into the snorkel Large capacity drain chamber and purge valve for easy clearing Hypo-allergenic silicone 2-window lens mask for maximum field of view Hyperdry purge snorkel 3 Year Warranty