The sealy pearl luxury posturepedic mattress combines an ultrasupportive posturetech 620 response spring system engineered to distribute weight away from the heaviest parts of your body together with a luxurious pillowtop layer to give a supportive and comfortable nights sleep the spring unit used in the mattress works to correctly align your spine whilst you sleep helping to ease neck and back pains this technology also eliminates tossing and turning during the night and significantly improves