evidence: Thomas, a transgender woman who swims for the Quakers women’s team, competed for the Penn men’s team for three seasons. After undergoing more than two years of hormone replacement therapy as part of her transition, she has posted the fastest times of any female college swimmer in two events this season. The letter from Thomas’s teammates raised the question of fairness and said she was taking "competitive opportunities" away from them — namely spots in the Ivy League championship meet, where schools can only send about half of their rosters to compete. "We fully support Lia Thomas in her decision to affirm her gender identity and to transition from a man to a woman. Lia has every right to live her life authentically," the letter read. "However, we also recognize that when it comes to sports competition, that the biology of sex is a separate issue from someone’s gender identity. Biologically, Lia holds an unfair advantage over competition in the women’s category, as evidenced by her rankings that have bounced from #462 as a male to #1 as a female. If she were to be eligible to compete against us, she could now break Penn, Ivy, and NCAA Women’s Swimming records; feats she could never have done as a male athlete."