The influencer and trans activist Dylan Mulvaney has published on her social networks a paid collaboration with Nike in which she announces tights and a sports bra of the brand, which has outraged many users of social networks and recognized faces of the sport since, according to media such as the Daily Mail, Mulvaney, who identifies as female, has not had sex-change surgery.

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British Olympic swimmer Sharron Davies is leading the boycott of Nike following the decision to sign an advertising deal to advertise bras with Mulvaney. This swimmer who won silver at the Moscow Olympics in 1980 says that Nike's decision is a "step backwards" for women's sport.

"It's very frustrating. We take two steps forward with World Athletics and Swim England protecting women's sport and then Nike does this." This refers to the measure announced a few days ago by the International Athletics Federation to prevent trans athletes from competing in international women's events.

Caitlyn Jenner, who was an Olympic medalist – who made the gender transition in 2015 and is popular, too, for having been a stepfather of the Kardashians – has assured that Nike's association with the trans influencer is "an outrage". Jenner has highlighted a series of tweets that for her, who grew up "admiring" Phil Knight – the founder of Nike – it is "a shame" to see how such an emblematic company acts like this.

"We can be inclusive, but not at the expense of most people, and you can have some decency while still being inclusive. This is a scandal," he said. And, in his opinion, inclusivity goes through "stop trying to erase women". "The differences between men and women are real and they are a good thing. Nor does that make trans people a bad thing," she insists.

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