Already the construction vouched some obstacles. The locking of joints engaged only under heavy pressure, the metatarsal turned on again. The mattress should be used as such insufficient and at best as slatted frame. An additional mattress I think is absolutely necessary. The collapse was a major challenge, since the locking of the central joints could not solve. Only with gentle pressure and a lot of patience, the bed was folded back. To make matters worse, can the "bed" does not fold back to the original measure so that a return in its original box is very difficult. The bed will definitely return!