Final answer:
The subject of this question is Business and it is asking about a type of mattress that combines a steel coil support system with foam. Examples of such mattresses include hybrid and memory foam mattresses which offer both support and comfort.
Step-by-step explanation:
The subject of this question is Business. The question is asking about a specific type of mattress that combines a steel coil support system with one or more types of foam.
One example of such a mattress is a hybrid mattress, which typically has a layer of pocketed coil springs for support and a layer of foam for comfort. Another example is a memory foam mattress, which uses memory foam as the primary comfort layer and may have a support layer of pocketed coils.
These mattresses offer a combination of support and comfort, making them a popular choice for many people.