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Therefore, the actual size of the complete trundle bed is similar to a regular mattress and box spring bed set.
The bed has a slat support system so there is no need for a box spring for either bed.
A popular type of bed, the platform bed, does not use a box spring to support the mattress.
Since there is no box spring under the mattress, platform beds are lower in height and provide users with firm support.
The mattress is usually placed directly on top of the horizontal platform eliminating the need for a box spring.