The 11" premium quality Night Therapy Hybrid Mattress has a luxurious Euro Box Top plush comfort layer on top of a core of hundreds of independent-operating springs. The result is a supremely comfortable mattress that is soft when you get into bed, yet super supportive throughout the night. The plush feel of this mattress begins with a rich poly-jacquard fabric that has a 1" backing of memory foam. Right below that is another layer of 2" super soft foam with our Pressure Relief Comfort system. The outstanding support of this mattress comes in the core layer from the hundreds of supple, independent-operating springs that provide the support your body needs.