The CARES harness is a red coloured belt that goes around the plane seat the child is sitting on, underneath the tray table of the person behind them. It is very easy and quick to install. Then the black harness straps come down over the child, and loop through the already existing plane seat belt. Perfect for those wriggly toddlers/preschoolers who are big enough to be on their own seat, but still so small.
Comes in a red carrier bag, and is very lightweight and able to squish into your backpack. Instructions also included, but are also written on the CARES harness itself.