Maybe a difference in the simple low density mattress toppers and a memory foam type mattress topper. Compare the density ratings. Memory foam mattress toppers are given a density rating in pounds. A higher rating means the memory foam will remember your shape better and last longer without sagging. The ratings can range from less than 3 pounds to more than 5 pounds.
Phil & Carla Kenley
2014 Rockwood ROO 21ss
2013 Ford 150 Platinum Crew Cab
(Looking at the Georgetown 329DS)
Nights camped in 2011/16; 2012/15; 2013/48;
2014/10; 2015/101 2016/55 yr to date