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.

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Kara Jillian Brown is the beauty editor of InStyle. She began her career at Well+Good, where she spent five years evolving from editorial intern to news writer to beauty writer. She earned a ...

Whether you have short hair that you want to lengthen, thin hair that you're looking to bulk up, or are just in the mood to switch up your hairstyle without the commitment of a more permanent change, ...