Features Spacious play area or storage underneath The low loft twin bed is ideal for space-saving needs Ladder with handrails, safety first Ships ready-to-assemble with step-by-step instructions Width of the open space at the bottom of bed: 76" As the child grows up, it can be used for several years Including guardrails for safety, ladder, and wooden support slats Mattress recommended thickness: 6'' Numbers of slats: 8Dimensions: Upper bed: 39.3'' x 76'' Total height: 46.3'' Railing: 13.7'' Weight capacity of upper bed: 150 lb