Transgenderism depends for its very existence on the idea that there is an ‘essence’ of gender, a psychology and pattern of behaviour, which is suited to persons with particular bodies and identities.This is the opposite of the feminist view, which is that the idea of gender is the foundation of the political system of male domination. ‘Gender’, in traditional patriarchal thinking, ascribes skirts, high heels and a love of unpaid domestic labour to those with female biology, and comfortable clothing, enterprise and initiative to those with male biology. In the practice of transgenderism, traditional gender is seen to lose its sense of direction and end up in the minds and bodies of persons with inappropriate body parts that need to be corrected. But without ‘gender’, transgenderism could not exist. From a critical, feminist point of view, when transgender rights are inscribed into law and adopted by institutions, they instantiate ideas that are harmful to women’s equality and give authority to outdated notions of essential differences between the sexes. Transgenderism is indeed transgressive, but of women’s rights rather than an oppressive social system.