The description of this topper was misleading and misrepresented the  firmness and quality of the foam. The foam flattened out somewhat where I get in and out of the bed. I turned the topper to the other side and it did the same thing within weeks. It advertised a bottom that would hold it in place but it slides all over the mattress, even hangs off on the edge where I get in bed. It has to be put back in place continuously.  The firmness was much less than I expected and it sank in with use. Now I have a topper with little craters on either side, moves around on the mattress and does not provide firm support. 
Bummer for me.  Don't waste your money.