The invention is directed to a seamless threading method of inserting hair extensions in a user's hair. The method includes sectioning and beading a user's natural hair. A bottom hair extension weft is then positioned under the beaded sections of hair. The beaded hair is then laid on top of the bottom weft and clipped to secure the bottom weft in place. A top hair extension weft is positioned above the bottom weft in a reversed orientation, with the beaded hair in between the two wefts. Next, a user sews through the top weft, bottom weft, and optionally the beads. The threading begins on a first side of the upper and lower weft strips, extends across the wefts to the second side of the wefts. The threading can then be reversed and sewn back to the first side using a single portion of thread. The upper weft can then be inverted, and the upper weft hair flipped back and smoothed down. Advantageously, the thread is seamless without being visible because the weft strips are sewn from the inside out.