Enjoy the support of a truly traditional coil mattress. The Devon mattress is constructed with a heavy duty Bonnell coil system which uses a 12-gauge wire. The Devon innerspring mattress is designed to respond quickly and contours to your body with a a traditional feel. Featuring a high density comfort foam topped with a quilted foam layer offers a firm feeling bed. The extra strength unique coil system offers a better sitting edge compared to most bonnell coil mattresses- allowing you to sleep more comfortably all the way to the edge.