WHY BALLOON INFLATION MATTERS👇 I’m only going to touch on the inflation of foil or mylar balloon in this video. Foil or Mylar balloons are those light weight printed balloons that come in many themes, shapes, sizes, and colors. Majority are of helium quality but all will hold air. You’ll see in this video how the foil spike I inflated at 80% is nice and tight, I can’t squeeze the sides much as I’m holding it up outside on a 95 degree day. Then I take that same balloon and go indoors where it is