Mattress Safe Sofcover Superior Total Mattress Encasement - Full Plus+ - Questions & Answers

The range you see after a mattress size is not referencing the mattress and box spring together. You should never use one encasement for both, always the separate ones designed for each. The range is for mattresses that vary in height. While most people have a standard mattress that is anywhere in height between 8 and 13 inches, some have pillow top mattresses or other specialty ones that can be very thick and often people will put other egg crates and items on top of the mattress for extra softness or support. The 16-22 will stretch up to 22 inches in height to accommodate the larger beds.