Team Logo. The Rio Grande Valley Sol was a team in the X-League Indoor Football. They previously played in the Lone Star Football League. They were left without a league after the X-League folded, and their future is uncertain. Retrieved from "https://prosportsteams.fandom.com/wiki/Rio_Grande_Valley_Sol?oldid=14488" Categories: X-League Teams LSFL Teams Teams in Texas Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.