This Select 100/30 is designed using data from the Comfort Solutions Lab® and is specifically formulated to suit the needs of those with the Comfort Solutions Sleep Code 100/30. Part of the Comfort Solutions Select Collection, this mattress consists of three layers of 100% Pure Foam which allows it to be conveniently compressed, rolled into a box and then risen to full height upon release. The comfort foam layers provide a pressure-relieving feel in the areas where you need it most while the supportive Pure Foam Core ensures your spine remains in alignment as you sleep. Only Pure Foam with no fillers or chalks, over a density factor of 25 is able to withstand being compressed and after the seal is removed, rising to full height!