The industry-standard for mattress
depth is 7 inches, with
most offering a comfortable 10 to 14 inches. Generally, the higher the load,
the deeper it needs to be. But quality is important as a well-built 10-inch mattress can
be equally as comfortable and supportive as a budget 12-inch mattress. A deep mattress also gives the impression of luxury,
whilst providing all the benefits of a regular mattress. With the development
of the popular pillow top, depths can go up to 24 inches.