Wrapping ribs in aluminum foil helps rib retain their moisture as they cook, and helps protect them from drying out in your smoker. You can also use foil to help infuse your ribs with added flavor. Add a little bit of beer or apple juice to the inside of the foil, and the vapour created will create an extra layer of taste. Wrap the ribs and your chosen liquid in foil, and leave enough room for the meat to breathe. Seal tightly to stop moisture leaking from the wrap.