(57) This invention relates to a replaceable cover system consisting of a hook-and-tube embodiment, a hook and pile embodiment attached to the slats, and an elastic band embodiment, to be adapted to a sofa design depending on whether a metal frame applied to wooden slatted metal frames in furniture sector have a mechanism or not, or on the mechanism used. The hook-and tube embodiment consists of at least two interlining pieces (2) stitched to the joint of two cushions (5); a metal tube (1) passed through a hole on the interlining piece (2) and hooks (3) which holds the metal tube (1) and fixes it to the sofa and also cover cavities (17) which allow the metal tube (1) to be attached to the hooks (3). The hook and pile embodiment attached to the slats consists of a left slat soft hook and pile (6) which is stitched to the slats (4) and wound around the slats (4) by overlapping, a right slat hard hook and pile (7), an interlining (9) stitched to the rear side of the cover (8) and on which a soft hook and pile (10) is present, a hard hook and pile (11) on the front inner side of the cover (8) by wounding around the metal frame (12). The elastic band embodiment consists of elastic bands (14) stitched to the rear face of the cushions (5), bridges (13) through which the elastic bands (14) are passed and by means of which the cushion (5) is attached to the slats (4), a female belt buckle (15) and a male belt buckle (16), which are located at the end of the elastic bands (14) and engage the elastic bands (14).