Surefit seat covers do not tell you the sides, seat back and head rests are nylon. J. C. Whitney makes it abundantly clear they do not care. The covers are no more than glorified slip covers. The only ad describes the one material but not the nylon. I was referred to the surefit seat covers by an online salesperson, after telling them I did not want the appearance of cheap slip covers bought at a department store. On other occasions I have purchased such covers made to custom fit with contrasting colored material of the same nature... read full review »