So if you want, just lay it down right on top of your mattress. (pbteen.com)
The quilted top is 100 % cotton and 180 thread count, so it is very comfortable for your child to lie on top of this mattress pad. (pottytrainingconcepts.com)
Features three adjustable mattress heights: 8.625», 12.5» or 16.25 «H (measured from floor to top of mattress support) (crateandbarrel.com)