As part of sealys most famous innovation posturepedic the seay firm support mattress is one of the most technologically advanced mattresses money can buy sealys research and development department which prides itself on focusing on the science of sleep created the posturepedic line of mattresses as a result of several advances in technology that they have identifiedthe posturepedic firm support mattress uses sealys patented zero deflection posturetech spring system the mattress is constructed