This cover worked perfect for me.  I have a Tempur-Pedic topper for my twin size hospital bed.  The topper measures 80 inches long and 3 inches thick.  So because this mattress cover fits over a 14 inch thick mattress, so it has plenty of extra fabric to cover my 80 inch topper.  The cost of this mattress cover is 5 times less money then the one that Tempur-Pedic sells for their topper.  This cover is well worth the price.  It's very soft and comfortable.  I would recommend it to anyone.