Boyd Sleep's lineup of Innerflex Bonnell Adult Hybrid Innerspring Mattresses combine a firm, coil foundation with advanced comfort foams to create the perfect feeling of "just right" sleep. Providing optimal support for the back, neck and joints, the medium-firm mattress is suitable for back, side and stomach sleepers. The York 8" hybrid mattress features a soft, contouring pressure sensitive memory foam and comfort foam combination quilted into the cover that adds gentle, yet targeted support. An additional 1.5" high-density layer of resilient engineered latex foam offers full body pressure-relief and contouring comfort. A 5.5" Bonnell coil base uses an array of sturdy, independent coil springs that maintain an even distribution of support. With a unique hourglass shape, the Bonnell coils compress slightly in the center to respond with gentle pressure while the remainder of the coil spring provides deep down support.