Is the fabric on the seat cushions of you furniture loose or wrinkling?   Are your seat cushions rounded off at the edges, flat, gapped, or uncomfortable?   In most cases its not the fabric but the seat core.  Seat cores are an oil base foam that do eventually go bad, some quicker then others.   Good news is that the seat cores can be replaced!   An upholstery shop will have the right cores you need and will usually cut them for you, and add the dacron layer at an extra charge.   Just open the zipper, remove by gently bending the core almost in half inside the cover, and install same way.   Be careful not to rip the fabric, or fold too much and rip the core, or break the zipper!      An electric turkey cutting knife works great for cutting foam cores, and can be found cheap at most thrift stores.    If your seat core is attached, give us a call!