A quilt top mattress comprises a spring unit and a cover fabric layer surrounding the spring unit. A quilt top layer overlies the fabric layer. The quilt top layer comprises an outer fabric layer, a fiber batt layer, a convoluted foam cushion and an inner fabric layer, all being secured together by stitching...http://www.google.fr/patents/US5974609?utm_source=gb-gplus-shareBrevet US5974609 - Quilt top mattress with convoluted foam cushion
