You've got it! A pop-up trundle does exactly what is says — pops up to create more space (or combine for a bigger bed). 1.A metal twin daybed with trundle to prove less is definitely more.

Black Metal Daybed Frame☆ This multifunctional twin size daybed frame can easily match a variety of home decor styles. It is an ideal choice for your bedroom, kids room, guest room, or living room.

VERSATILE SPACE SAVING DESIGN: This daybed with pop up trundle provides ... SIMPLE ONE COLOR STYLE: The clean lined black finish of this twin bed with trundle bed under is versatile to match ...