A trundle bed features a secondary bed frame that slides out from underneath the main bed.
Trundles are excellent for guest rooms, kids rooms, or any space where you need occasional extra sleeping capacity.
Pop-up trundles can rise to the same height as the main bed, creating a king-sized sleeping surface.
Standard trundles stay low to the ground, which may be less comfortable for adult guests.
When shopping for trundle mattresses, look for lower-profile options (typically 6-8 inches) that fit the trundle frame.
Pop-up trundles have evolved significantly. Modern hydraulic pop-up mechanisms can raise the lower bed to match the main bed height smoothly and quietly, creating a king-sized sleeping surface for couples or sleepovers. This dual functionality makes them excellent for guest rooms.
Trundle mattresses need to be thin enough to slide under the main bed frame — typically 6-8 inches maximum. This limits your options to thinner foam mattresses. Our top picks for trundle mattresses include the Zinus Green Tea 6-inch and Linenspa 6-inch hybrid.
Consider the floor surface when using a trundle. Wheels or casters roll smoothly on hard floors but can damage carpeting with repeated use. Some trundles use glides instead of wheels, which work better on carpeted surfaces.