This "Floating Snorkeling Window" is perfect for people who don't want to use a mask and snorkel. Inflatable model with clear "Aqua-Optics" window for underwater viewing. The new Sea Window X4 FSW "Floating Snorkeling Window" features a unique and advanced underwater viewing system. The patented design using Aqua-Optics delivers vision below the water that is magnified 25% crystal clear and free of all the problems associated with mask and snorkel use. No more burning eyes, leaks or choking. Inflated size 14" x 14".