Sleepfresh Clean And Cool 12" Medium Hybrid Twin Mattress pairs cooling surface technology with memory foam comfort layers and a resilient polyurethane base to deliver balanced, all-night support. A breathable cooling cover works with memory foam to help dissipate heat while the hybrid core provides responsive support and reduced motion transfer for a medium feel. Ships compressed as a Bed In a Box for simple setup and is made in the USA with a 10-year warranty for dependable performance.