Pretty sturdy! Nice upholstery fabric used. Very very easy to put together. Four sides and each side interlocks with each other and then you put a very hard thick plastic bolt in each corner through the locked corners. The slats come wrapped or not wrapped. I chose the wrapped because I had no idea what they would be like un-wrapped? But the wrapped slats are in a heavy polyester type of fabric? After you have put the frame together you take each set of slats and lay them over the top and they lay over a 1 inch lip that runs along the rails. And they do stay in place. But there isnt any velcro along the lip which I thought there would be so the slats dont move? But surprisingly they dont! It is the fabric I assume that keeps them from slipping out of the groove? Its works for me and my new foam mattress that I just purchased from Wayfair also! Thankyou again Wayfair!