This twin bunk bed is shipped in two boxes, and delivery times may vary. The upper bed frame measures 79.5" x 44" x 12" (L x W x H), the lower bed frame measures 78" x 40" x 12" (L x W x H), and the trundle measures 75.5" x 40.5" x 10.5" (L x W x H). The recommended mattress thickness is 6" for the upper and lower bunks, and 4"-5" for the trundle (mattresses not included). Designed for versatility, the convertible twin-over-twin bunk bed can be separated into two individual twin beds and one twin-size trundle, ideal for accommodating guests or friends in separate rooms. The trundle includes smooth-rolling wheels for effortless movement without scratching the floor. Constructed from solid pine wood, engineered wood, and plywood, the bunk bed ensures exceptional durability and stability, with weight capacities of 350 lbs for each twin bed, 175 lbs for the trundle, and 200 lbs for the ladder. Multiple evenly spaced wooden slats provide reliable mattress support without requiring a box spr