First let me tell you...dont let this short lil box fool you!
It expands very well...
  I purchased this for my daughter who has very sensitive skin so the unpacking begins with letting it air for 24 hours or more. This also allowed it to expand fully. There was no odor lingering.

  We were very pleased after placing on the existing bed frame,as it really formed out well to the exact 8 inches! 
  It comes with removable zippered matrress cover qhich means my daughter's skin will not directly touch the mattress but will still feel the comfort of it. 
Her first reaction was that it was too soft...but after sleeping the first night...
   She was very pleased...stated it was very comfortable and formed to her body shape....and actually firmed up at bit....allowing her to prop herself up to read with pillows behind her.
Very pleased with this purchase.