After doing our own robot demo today, and having forget all of poof balls *smacks head*, we improvised with balloons. To keep the balloons from popping, inflate it so that it is approximately the same size as a poof ball. Then take duct tape in small strips (long strips rip balloons) and cover every square inch of the wannabe-poof ball. The duct tape prevents the balloons from snagging and popping. This idea works great! Try it!
