Tools, Tips, Technique
Tools: Rubber bands are found more easily in a supermarket or a stationary store, than in a professional hair supply store. They come in all colors and are usually quite fragile, the ones sold in supermarkets are the strongest I have found.
They are most often used to gather a ponytail or a braid in place, they can also be used as an additional support when hooking heavy extensions at the roots.
Put a little serum on the elastic before using this makes it easier to remove and less likely to catch on hair strands and break them break them.