A crisp chill in the air marks the start of sew-in season. This extension method involves sewing tracks of hair onto braided patterns close to the scalp, and it's long been a go-to for added length ...

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.