I purchased this item (the full size, 52X73) at the Wasilla, Alaska Wal-Mart store. Last summer I had bought a twin-size one there, for a fold-out bed with a thin mattress in my guest room. That one was very good - expanded into full thickness within an hour, and my guest said it was very comfortable. Unfortunately, the full-size one was apparently sitting around rolled up tightly in the package for way too long. 48 hours after unrolling it, it still has not expanded to the full 4" thickness - in the center, it's only about half that thick, and there's a six-inch margin around the entire edges where it has not expanded at all - it's just like cardboard. I tried flexing it back and forth, "massaging" it, warming it with a hair dryer - no results. I'll take it back, but if offered a new one, how can I tell if it will have the same problem? Have they all been sitting around so long they got damaged? If you are considering getting one, ask if they know how long it's been in the package. Like I said, the first one I got was great - but this one is worthless.
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