This over-sized two person swimming pool mattress measures 78 inches, with more than enough room for two swimmers. This comfortable pool mattress float features a clear top for even tanning and hours of relaxing in the sun.Family owned and operated, Swimline Corp. has grown to be the largest manufacturer of above-ground swimming pool liners in the world. Swimline's products include an array of leisure pool supplies and equipment with everything from inflatable tubes and loungers to floating lights and pool organizers. If you're looking for products that combine fun with water, you've found it at Swimline.