I ordered the 3” mattress topper which arrived in a week.  It came in a box and I had it air-out for 72 hours.  The topper was easy to place on my mom’s bed.  We tried an older flannel sheet set but it wasn’t deep enough.  We then tried  a new flannel sheet set and there plenty of room.  You could feel the difference right away.  The bed was much comfortable and softer.  This were 3 different zones on on the topper just like the picture.  My mom stated she slept much better without waking up.  After I week of sleeping on the topper she said she wished she had gotten one a lot sooner!