Attach your Baby Jogger or Graco infant car seat to your Baby Jogger City Mini 2 Double or City Mini GT2 Double stroller to convert to travel system Attaches one infant car seat per stroller Easy safe installation and removal Compatible with City Mini 2 Double and City Mini GT2 Double strollers Use only with certain Baby Jogger or Graco infant car seat models find a full compatibility chart on the Baby Jogger website