The quilt features silk, wool, and cashmere for a soft sleeping surface that also helps regulate body temperature. Beneath the quilt, two layers of PrimaSense Gel Foam provide initial pressure relief in the top portion of the mattress. An additional layer of PrimaSense HD Gel Foam has a higher density to provide a more solid overall feel. The PrimaCore Gel Foam center is designed to reinforce back support and provide more support to the lower back area where you need it most, as well as enhance long-term durability to resist body indentations. Back support is provided by the Intellicoil Advanced system which uses a two-stage coil where the outer coil is a bit longer and designed to contour to your body while the inner coil is a bit shorter and designed to provide solid support. This individually wrapped coil system is very good at both contouring and reducing motion transfer which makes it especially good for couples. The Precision Edge system features extra thick coils at the edges to prevent roll-off and help maintain consistent support all the way to the edge of the mattress.