Similar to side stitching, lay-flat binding is very durable. However, the gutter is detached from the spine of the book so that the book can adjust and lay flat. FOREVER® uses Flexbinding, which works by transferring the stress normally placed on the binding to the laminated hinge on each page. This enables photo spreads to flow smoothly from one page to the next for dramatic visual presentations. This method is only used on hardback books and is excellent for photobooks.