Foil Balloons are sensitive to extreme temperature changes. In cold air, they may appear deflated; warm air should expand them again. Extreme heat could cause the helium to expand and burst the balloon. Inflated with air this balloons stay inflated for months.Foil balloons may conduct electrity. Do not release helium-filled foil balloons outdoors or use near ovrhead power lines. If you are filling it with air, than you must pay attention to the folds on the baloon becouse they must remain. Not Suitable for Children under 36 months due to potential small partswhich may pose a choking hazard. Adult supercision reguired. You are adviced to keep this information for future reference.