From the manufacturer
PrimaSleep 12 inch Multi-Layered Hybrid Euro Box Top Spring Mattress is designed to make your back more relaxed while you are sleeping. Featuring multi layers of foam, you'll get the pressure point relief, temperature regulation, and support you need. Among those layers, the memory foam supports and aligns the spine for all-night comfort. The HD foam layers keep the mattress feel medium-firm while adding structure and support. Independently encased coil springs offer you a sweet and comfortable sleep from responding to body movement and the contour of the body. We assure you will feel less movement from your partner unlike a traditional innerspring that has interconnecting wires between coils.