A group of scientists and humanities scholars has written an expert commentary about the recently published ‘Scientific Review’ by the Canadian Centre for Ethics in Sport about transwomen’s participation in female sport. The CCES Review, claim the authors, doesn’t deserve its name; it is wholly unscientific, another attempt to replace materially based eligibility criteria in sport with ‘social identity’ as a passport to inclusion, and they highlight its shortcomings in methodology, and its sometimes incoherent, sometimes misleading argumentation.