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. This 5 inch mattress sits at the lower end of the scale, generally for a lighter person this matters is easier to store and Hanover.