15″ guardrails accommodate standard mattresses and keep kids safe. Slats make checking in at night easy. Includes slat rolls. Smooth drawer glides in desk. Measures 81.5″ x 81.5″ x 68.5″ (LxWxH), perfect for smaller rooms. Recommended for 8 feet ceiling height above. Pencil-stop lip on desk prevents items from falling off the surface (option to add cork board – purchased separately). The Twin Bed fits L-Shaped under the Twin Loft (option to add castors – purchased separately).