The Magniflex Magnistretch 14 Twin Size mattress. The unique patented-system mattress lengthens and stretches the back during rest. The mattress was designed in collaboration with the University of Zaragoza in Spain to foster the stretching of the spine. The result is a reduction in muscular contractions and spinal compression as you rest. Please scroll down to see greater detail on how it works. Also be sure to consider an adjustable base foundation for this design.