Providing a cool, comfortable and supportive sleep environment, the Kingsdown San Simeon mattress offers the firm comfort you need to fall asleep, along with the pressure point relieving support you need to wake feeling restored. Featuring advanced gel infused memory foam right at the sleep surface, this mattress pulls excess heat away from your body to keep you cool and comfortable, eliminating the discomfort that leads to tossing and turning. Additional thick layers of firm foam and supersoft foam provide additional body-contouring firm comfort, while tri-zoned individually wrapped coils adjust to support your body precisely where you need it most. Last but not least, a ventilated Full Body Surround foam encasement keeps air flowing throughout the mattress while providing a larger usable sleep surface. 10 Year Warranty.