I ordered this to add a little buffer to go with the new mattress we just ordered.  I chose this one because ones I have owned in the past have had the larger "box" type squares and the minute you wash/dry them, the padding becomes lumpy in varoius sections of the squares ans is almost impossible to get back to normal. I did think this would be a little thicker, it didn't puff up at all and was definitely not 1", but I can't really say anything negative, other than that.  Maybe I should have shaken it out to puff it up or give it time before putting the sheets on?  I'm not sure, but it will work until we order a thicker one to take it's place. There is nothing wrong with it, I just thought it would provide more of a noticeable difference when put on the mattress. It's got deep pockets so it would have no problem fitting on a thicker mattress (we switched to the 8" memory foam one).