a thermoplastic film having a permanently embossed design or geometric shape built therein for controlling the coefficient of friction of sheets of the film when placed adjacent each other . the film has a relatively smooth or female surface on one side and a relatively rough or male surface on the other side . by varying the relationship of one sheet of film placed adjacent another sheet of film or a surface area of the same film , a desired level of coefficient of friction can be obtained . a relatively low coefficient of friction is obtained when two sheets of the film are placed adjacent each other in a female side to female side relationship . a relatively high coefficient of friction is obtained when two sheets are placed adjacent each other in a male side to male side relationship . the film may be perforated or non - perforated and single layer or multi - layer .