It is called daybed, day beds, trundle bed, Day beds trundle and guest beds. This section has some of our Day beds furniture styles. There are two kinds of the day bed mattress support. If the day bed furniture style requires a wooden slat support kit it is always included in the price. Some daybeds furniture styles require the link spring that could be purchased separately if it is not indicated on the style’s page. Most of our day bed furniture styles will accommodate the pop up trundle, and some of the wooden day beds furniture styles will accommodate the role out trundle. Please note that the mattress is sold separately. The price is for the frame only- back, sides, and link spring. Our day beds collection is designed by coaster furniture, hillsdale furniture and night and day furniture. Many styles to choose from and even more than you see on our online catalog.