I loved these so much! My aide and I used helium to blow them up the day before and have them on my students chairs buuuutttt the next morning they were deflated. So I think if I had waited until that morning to use the helium it would have been better. But the balloons themselves are amazing and I recommend them. I also recommend blowing them up the day of, not the night before to those teachers who are like me and like to check things off a their list. ??‍♀️