in solution iii the sheet comprises antibacterial substances which are added to the fabric by means of an impregnation process the techniques described in points i u2013 iii can be used alternatively or combined for example it is possible to produce a three layer fabric impregnated with antibacterial substances or the fibres of which contain the incorporated antibacterial substance the mattress cover sheet subject of the present invention is of the dimensions necessary to cover a mattress or a pair of mattresses for example 1 5 u00d7 2 5 meters or 2 5 u00d7 3 meters and is preferably provided with common means of attachment to the mattress such as buckles belts or hooks or can be designed to wrap around and below the side edges of the mattress the sheet can also be produced in a bag version thus covering the entire mattress surface a further aim of the invention is a process for producing a mattress cover sheet characterised by the use of a spunlace fabric among the materials making up the sheet the spunlace fabric can be in a ready to use form or can be produced extemporarily by entangling a layer of fibre as described above in the latter case reference is made to the known processes for the formation of spunlace fabric such as those illustrated in the previous description of the known technique for production of the sheet according to one of the preferred solutions i u2013 iii described above the process will include respectively to produce the multilayer fabric the layers of fibre are overlapped in the required order and directly subjected to the spunlace.