Double-drawn hair undergoes an additional process during manufacturing. The shorter hairs are removed and replaced with longer hairs to get all hair in one length. The alternative is to cut the human hair at the ends so that fullness remains the same from top to bottom and then the hair is sewn into the weft. This significantly increases the quality of the hair extensions and provides for a more healthy full appearance. You will pay more for double-drawn hair, but it has better quality and very full volume as well as a long duration.