Love this new mattress! It has the 7.5 inch coil springs we have always had, along with 2 types of foam (about 2.5 inches) as a topper. It's like a pillow top except that the foam is not in a separate pillow, think they call this a Eurotop mattress. Whatever they call it, it is very comfortable yet gives ou sufficient support to sleep either on your back or side. It came highly compressed in a box measuring about 2 feet square by 3.5 feet high. It weighed a lot (the shipping bill said 98 pounds, not sure it was that heavy, but heavy). Once you cut the taped wrapping (carefully), it immediately expanded to it's full 76x80x10 inches. Amazing. A+++