The bunk bed is a great space-saving bed for both younger and older children comprising of a spacious sized bottom bunk and a standard bunk. The bed bases are made from a firm, durable mesh that will withstand even the most vigorous treatment from your kids. The bunk bed is ideal for growing families or just as an extra bed for when friends come to stay. Built To Last. The internal structure of this product is made using tubular metal which allows it to be lightweight though more importantly sturdy and strong. The bed bases are made from firm, durable mesh that will withstand even the most vigorous treatment from your kids.