Mattress: Inner Structure/Material: 1.1 Quiltedcover fabric:knitting fabric 1.2 Quilted foam:25kg/m3 density 1.3 Latex Layer:75kg/m3 density 1.42pcs:hard pad(euro top) 2 Pocket spring:18cm(h),wire guage 2.0 mm, with 5 cm foam eage around spring . 1.42pcs:hard pad (bottom) 1.2 Quilted foam :25kg/m3 density 1.1 Quilted fabric :knitting fabric (bottom Features pocket spring: Each Independent operating ICoil Spring moves independently, responding to body movement and the contour of the body. Because they're not connected by interconnecting wires, each spring works independently. The weight on one spring doesn't affect the surrounding springs. Thus our mattress helps you to sleep undisturbed. With each Independent operating iCoil, you will feel less movement from your partner unlike a traditional inner spring that has interconnecting wires between coils. Foam: High density and elastic sponge support the back more effectively, softly and exquisitely gain prominent restoring force. Notes:1 after being compressed, it is suggested that it open within half a year to keep the size being 95% of its original size. 2 Make sure that the internal mattress being circulating, maintain clean andsanitary 3 Eliminate the body's metabolism and peculiar smell