This functional twin loft bed supports your mattress with materials including Metal, Engineered Wood, supporting up to 485 lbs, measuring 78"" x 40.5"" x 68"", accommodating a mattress of 6""-8"", equipped with safety guardrails for secure sleeping The no-box-spring-needed design simplifies setup and saves on additional costs Assembly is straightforward with labeled parts and clear step-by-step instructions.