Sleepfresh Clean And Cool 12" Medium Hybrid Twin Extra Long Mattress delivers balanced support and cooling for a more restful night's sleep. Its hybrid design blends responsive coil support with layers of memory foam and polyurethane to provide medium, pressure-relieving comfort and targeted contouring. A breathable cooling cover helps wick heat away, the mattress ships as a Bed In a Box for easy setup, and it is made in the USA with a 10-year warranty for long-term confidence.