The Nightsbridge 12" Firm Hybrid King Mattress pairs a firm, support-forward feel with cooling performance to help maintain alignment and comfort through the night. A memory foam comfort layer cushions pressure points while a pocketed coil core and polyurethane support layer provide responsive lift and long-term durability. The black cooling cover breathes to reduce heat buildup, the mattress ships compressed in a Bed In a Box for easy delivery, and it is made in the USA with a 10 year warranty for confidence and convenience.