SPRING MATTRESSES, also known as innerspring mattresses, were first introduced in 1871 and gained popularity due to their support and bounce. Prior to spring mattresses, beds used to be similar to large pillows stuffed with materials like cotton, hay, wool, or down—not lending sufficient support. Adding a coil layer improves mattress support.

The basic structure of spring mattresses include metal coils or springs for support, which is encased in foam, forming the “support layer.” This layer is topped with upholstery forming the “comfort layer.” The layered upholstery ensures that the sleeper doesn’t feel the coils and springs directly under their body, which may lead to discomfort. The upholstered layer includes a quilted top that determines the mattresses’ plushness and feel. Various types of foam layers, fiber pads, quilts, coils, and springs make up a traditional spring mattress.

While the quilted top, foams, and fiber pads contribute to comfort for sleepers, the coil system lends support and promotes airflow within the mattress, enhancing its breathability. Coil layers of varying densities form the base structure of spring mattresses. Stomach sleepers may benefit from the coil layer because it pushes back preventing their body from arching unnaturally.