MICRO WELDING HAIR The hair extension and fullness method, which is made by adding thin tufts to the hair, is called micro welding technique. Italian keratin is used. Transparent keratin is no different from hair color. In Hoops Beauty Center, micro-welding can be applied not only to lengthen the hair, but also to give it a fuller and healthier appearance. The hair used consists of Uzbek, Russian and Turkish real hair.