The hand tied weft is quite versatile because it is nice and flat and designed for bead-in application. The technique creates a very strong, non-damaging and long-lasting solution for those with all types of hair, including very thin and fine. Sew in Wefts require no heat, tape, or glue and the hair is reusable for up to a year. For this hair extensions method, move-ups are required every 4-6 weeks then reinstallation 4-6 weeks after that.