Slumbr SunsetSlumbr Sunset Mattress in a Box Drift into comfort with the Slumbr Sunset a premium medium feel mattress designed for restorative sleep. Featuring a High Density Foam comfort layer atop a 3 Zone Indie Coil Pocket Spring Support System, it offers targeted support where you need it most with minimal partner disturbance. High Tensile Edge Support maintains long lasting shape and stability, while the soft, quality knitted fabric adds a touch of luxury.