Aqua Lung Sport Cozumel Mask/Seabreeze Snorkel/Proflex Fin Snorkeling Set - Unisex Mask features 2 windows Silicone face skirt provides a comfortable fit and leak free seal Wide comfortable head strap with 3-way Easy Adjust buckles Snorkel features a Hydro-Adhesion splash top which is designed to prevent water from entering the snorkel barrel. A one-way purge valve allows easy exhaust of any water that may have found its way in.