How thick should a memory foam overlay be?
Just like the density, manufacturers may produce their memory foam toppers in different thicknesses to cater to the wide differences in consumer preferences. You should be aware, though, that there will be a good thickness to density ratio to provide the best support, comfort, as well as durability. Generally, the thinner the overlay, the more density it should have. 2, 3, and 4-inch memory foam toppers are the most popular.
