Improvements to panel fastening clips, especially to those used in curtain and/or lateral airbags, of the kinds of clips that are formed by a surface and/or several flexing arms that are designed to be located in the outer part of the panel into whose opening they are inserted, including several feet that are more or less elastic and that tend to converge at their ends in the general shape of an inverted "V" in the direction in which the clip is inserted, as well as several wings whose ends work against the lower surface of said panel and which ensure that said clip is fastened to said panel, characterized by the fact that the ends of said wings have an enlarged working surface against the lower surface of said panel.