Sometimes called an Ensemble, a mattress set is often made up of a box base with a mattress placed on top. While the quality of mattress is the most critical element of an ensemble, you shouldn’t ignore the state of your base.
A mattress should be chosen based on comfort and your budget. To find a mattress that's comfortable, simply try lying on as many as possible! Stores such as Bedshed are happy for customers to lie down and test mattresses for comfort.