Discover Balmain Hair Professional's Weft Extensions. The Weft Extensions are designed to easily add volume and length to the natural hair. An application of a Backstage Weft equals an entire volume and length treatment. Balmain Hair Professional's Weft Extensions are made of 100% high quality Human Hair and Memory® Hair. Memory® Hair is a unique copy of natural hair, the patented technology even allows to treat the Memory® Hair with heat tools up to 160 ⁰C. Balmain Hair Professional offers a wide range of different colors and lengths of the Weft Extensions.