metallic light blue balloons 36 pack - baby blue balloons 12 inch - pearl pastel blue balloons for gender reveal baby shower elephant birthday party graduation decorations treasures gifted generally, 12-inch latex balloons filled with helium will float between 6-10 hours. balloons filled with air will stay inflated between 8-10 hours outdoors and 12-20 hours indoors. avoid placing balloons near sources of heat and direct sunlight. helium is sensitive to temperature. for outdoor displays, under-inflate the balloon by first over-inflating the balloons then releasing gas so the balloon can easily expand later. in preparation for a party, test only one balloon the day before to monitor heat, humidity, or rain in your environment. caution: please avoid contact in case of latex allergy as products are made of natural rubber latex! popped latex balloons are a chocking hazard to children under 8 years. please supervise energetic and playful pets from accidentally popping balloons.