The world of hair extensions is vast. From clip-ins to tape-ins to sew-ins, girlies who want to add length or volume to their hair have plenty of options. If you happen to fall into this camp, you ...

First things first: Sew-in weaves are a process where your natural hair is braided down into cornrows, says Nash, and a needle and thread are then used to sew down hair extensions onto the braids.