Sturdy Frame: Adopt a square frame structure stronger to make the bed frame more stable, the maximum bearing capacity can reach 400 pounds. Safety Guardrail: Strong security guardrail to ensure your safety, the recommended use of 4”-6” mattress thickness. Make sure the top of the mattress is at least 5 inches from the edge of the guardrail. Small Space Friendly: Bunk bed design effectively releases the space for a small bedroom, allowing 2 kids/adults to share together. 10.6” underneath provides you with mats or sundries, toys, etc.