This best-selling Twin Low Bunk Bed With Stairs from Max and Lily features a space-saving design perfect for smaller spaces, with the bonus of add-on safety guard rails for the bottom bunk to discourage rolling or falling out of the bottom bunk. These rails can be added or removed to and from the bottom bunk over time and as needs change. The top bunk features built-in extra tall, 14"" guard rails. With solid, knot-free New Zealand pine wood construction and a high 400-pound weight capacity per sleeping surface, the design is safe and secure for kids. The bed safely fits standard twin-size mattresses up to 8 inches thick. The bottom bunk sits only two inches off the floor, making it the perfect sleep option for little ones. The safety guard rails added to the bottom bunk are 13.25 inches tall and can be removed as your child grows. Please note that while add-on guardrails rails can help restrict access and give a sense of protection, they do not prevent all accidents or injuries.