All latex and foil balloons are suitable for filling with air or helium (with the exception of air fill only letters, numbers, and script words as indicated in the product description). If you want balloons to float, they must be filled with helium. Helium float time varies based on elements and altitude etc. Most standard latex balloons will float for 6-8 hours indoors at room temperature. Mylar (foil) balloons will float for up to 5 days at room temperature. If you need your latex balloons to float for a longer period of time we recommend adding Ultra Hi Float to your balloons before inflation.