Amanda Calabrese and Greta Meyer turned a college project into Sequel, the first spiral tampon, now backed by a WNBA partnership with the Indiana Fever. In 2019, they created Sequel, the world's first spiral tampon, engineered by and for people who actually use it. One day in a shared entrepreneurship class, Meyer approached Calabrese with an idea: why not build a better period product? "Tampons have vertical channels that go top to bottom on the outside of the product," Calabrese explains. She notes that the first period product someone uses is often the one they stick with for life.