Solid 100% knot-free, New Zealand pine wood construction and the flexibility to convert these bunks into separate beds set and bunk beds apart. A sleepover classic, the included trundle provides additional bed space and rolls on casters. What's Included? Trundle Bed Included Guardrails Included Detachable Guardrails Included Built-In Ladder Included Slat Kit Included Features The space between the bottom of the top bunk and the top of the bottom bunk (not including a mattress) is 33.5 inches.