is standard seat foam a mould?

hey

the foam in my drivers seat is now knackered, i phoned up an upholstery place and they said they couldn't do the bolsters as the whole seat foam is a moulded piece. is this true?
 
Not 100% sure but I'd say every mass produced car will have molded foam seats, tbf I'd have expected an upholstery company could repair it, I've had a bike seat remade including foam so can't see a car being too different