Texas Rollergirls is a women's flat track roller derby league based in Austin, Texas. Founded in early 2003 and widely credited as the league that started the modern roller derby movement, the Texas Rollergirls were the first flat-track league in the nation to play a version of roller derby using new standardized rules and a track design based on the dimensions of the old banked tracks. As flat-track derby caught on in other American cities, the Texas Rollergirls' rulebook and track design eventually evolved into the specifications that were adopted and ratified upon formation of the Women's Flat Track Derby Association (WFTDA) in 2005, of which Texas is a founding member.