I am getting nervous, as it has been nearly 48 hours since our memory foam 10 inch mattress was unwrapped after being delivered on Christmas Eve and it is not fully expanded yet. This mattress was a gift to my son and represented a big expense for our family. After a night on the new mattress, he claims that he feels like a train ran over him. The mattress cover is sagging and too large still for the mattress. I hope this was not a big rip off. Consumers should be wary of these simple and modestly priced memory foam mattresses that do not come with foundations. When the memory foam is combined with other layers and made into an expensive sleep system, the end result is probably better. Purchasing the more modestly priced memory foam 'pads' may not be viable alternative for folks like us who cannot afford the expensive sleep systems.