Cushions and mattresses are covered in stockinette by machine. The TRICOVER machines encloses all your mattresses, pillows and cushions with a strong Polyamide (Nylon) or Polyester cover. Fast, smooth and efficient. The video’s on www.tricover.com show the operation of the machine. Heynen Systems b.v. manufactures since 1979 the custom made TRICOVER stockinette in its own plant at Lelystad, Netherlands.