With every Sealy mattress you get a lot for your money. A history of craftsmanship. Modern design. Quality materials. Comfortable mattresses at a fair price. That's the value of Sealy. Our innersprings, like our sleep sets, are made to last. Our twice-tempered PostureTech™ coils retain 98% of their height and performance, resulting in a more durable mattress with longer lasting comfort. Sealy is the only manufacturer that features twice-tempered coils. The Advant-Edge® System is inserted between the outer two rows of innersprings, this is the Sealy basic edge system offering stability not seen in most entry-level mattress edge systems. The Advant-Edge® PLUS System takes the stability of the Avant-Edge® and adds this premium edge system around the perimeter of the mattress so you can sleep more comfortably all the way to the edge.