Which type of hair extension involves the use of a weft?

Weave extensions are specifically designed to utilize a weft, which is a collection of hair strands sewn together at the top. This construction allows the weft to be securely attached to the natural hair through various methods, such as braiding or sewing, providing a longer-lasting and versatile option for adding volume and length.

In the case of clip-in extensions, they come with small clips attached that can be easily applied and removed without requiring a weft or a more permanent installation method. Keratin-tipped extensions utilize keratin bonds to attach individual strands of hair to the natural hair, not involving wefts. Micro-link extensions attach individual strands through small beads that clamp down on the natural hair, bypassing the use of wefts entirely. Therefore, weave extensions are the only type listed that directly incorporates a weft in their application process.