The Bob Barker Cotton Core Mattress is treated and infused with boric acid in a patented wet process for greater fire retardeny. This exclusive cotton mattress features a three layer core construction. This process ensures that the broic acid will not wash off, shake offor dust out during the life of the mattress, unlike traditional cotton matresses where fire retardancy dissipates with use. By using a firm cnter between two softer layers, this improves resistance to body compression and increases the life of he mattress.