Heatless cold fusion technique, also called machine weft. This weft is much thicker than genius weft and hand made wefts. It is ideal for people who want to give a lot of volume to the roots. This type of weft is also used very frequently to sew clips. Weft extensions provide a lot of volume to the hair thanks to their exceptional coverage. Our envelopes contain 50g of hair. The extensions are reusable and must absolutely be installed by a professional. Normally, a weft extension should be maintained every 6-10 weeks, depending on hair density.