U 12 indoor flares we will not rest until…Author:Men In BlazersUpdated:May 8, 2015Original:Jan 9, 2012U-12. Indoor. Flares. We will not rest until similar scenes play out at gymnasiums across America’s heartland.pitchinvasion:ŠK Slovan Bratislava ultras at a U-12 Unicef Cup indoor game.