All Latex Balloons include "Super High Float" which coats the inside of the balloon and extends the float time. All of our latex balloons are guaranteed to float for 24 hours if kept indoors, out of major drafts and out of direct sunlight. Float time on balloons kept outside will vary greatly and are not guaranteed for any particular length of time. Weights are not included but can be ordered as a separate item. Be aware that many hospitals do not allow helium balloons, so please check with your local hospital prior to placing your order if the recipient is a hospital patient.