Slat-free by design, the full 75 by 54 inch surface stays smooth enough for a child to crawl across during daytime play and settle onto at night. Fence railings enclose the whole perimeter, and the door works three ways: latched shut, swung open or removed entirely as a child grows. Solid pine wood with plywood railings keeps the frame steady at just 16 inches tall, low enough that a toddler climbs in without help and no box spring is needed.