Sky Eyebrows Threading Salon | San Diego, CA Hair removal service in San Diego, California Threading is an ancient technique of removing hair. Threading is very popular in India and the Middle East, and now its popularity is growing in the West. Practitioners use a thin, twisted cotton thread which is rolled over usually untidy hairlines, mustaches and other areas of unwanted hair, plucking the hair at the follicle level. Unlike tweezing, where single hairs are pulled out one at a time, threadin