A machine double weft hair extension, or in short, a weft hair is a salon favorite type of hair extension that a collection of real human hair strands sewn onto a very thin horizontal strip. Weft hair extensions will keep the hair from tangling, saving hours of time when styling and combining. Weft hair is a gorgeous, painless and natural-appearing option if you want to add thickness to your head. Vietnamese weft hair grade is classified into super double drawn, double drawn, and single drawn. They are different in long hair ratios in one bundle. Normally, 2-3 weft human hair extension bundles with one closure or frontal will be enough for a beautiful head. Depending on your desired requirement, let’s choose your most favorite styles and its thickness.