Sofa beds are engineered to perform double duty, providing both a comfortable spot to sit during the day and a cozy place to sleep at night. To fulfill these roles effectively, they must possess a robust frame capable of supporting the sleeper's weight. Hence, sofa beds typically have a firmer build compared to conventional sofas.
Additionally, sofa beds commonly incorporate a metal frame to support the mattress. This metal construction further reinforces the firmness of the sofa bed, making it a durable and dependable choice.
Furthermore, owing to the particular configuration of sofa beds, the mattress must be foldable and sufficiently compact to fit into the sofa's frame. This often necessitates the mattress being thinner than the standard variety. To compensate for the reduced thickness, the sofa bed's structure must be more resilient.