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.

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