From their official Web site:
 
The Kansas City Roller Warriors, LLC, is KC's premiere all-female roller derby league. League members are proud to join the ranks among several other newly formed competitive, amateur leagues in more than 80 cities across the country. A true blend of sport and spectacle, this "Neo-Derby" is something unlike anything the world of athletics has seen. The league is comprised of about 70 member/owners and includes four teams. The regular home season runs from April through August. The Kansas City Roller Warriors promise to capture you heart and then skate all over it - until it bleeds.