The Edge Series by Sleeptronic® utilizes the industry leading Quantum Coil from Leggett and Platt. These mattresses are specifically designed to conform and Flex when utilized on an adjustable bedbase. And with extra supportive coils around the perimeter edge, the Quantum Coils in The Edge series provide a firmer and more supportive edge that prevents the all too common "rolling out of bed feeling" that many budget mattresses exhibit. Quantum Edge Steel Perimeter bends and average of 24% more easily than foam encasement, which means less wear and tear on moving parts and a more “friendly” performance on adjustable bedbases.