Though threading has been among Asia’s most popular depilation methods for thousands of years, it only recently made its way onto the service menus of Western spas. The ancient practice has shown signs of becoming more of a spa mainstay, however, thanks to an eco-friendly process that also manages to stay on good terms with sensitive skin.

For evidence of threading’s rapidly expanding popularity, one need not look further than Brow Shapes' Eastern-inspired treatment menu. When not sculpting brows into precise arches, the spa’s artists rely on their attention to detail to draw henna tattoos that depict flowery swirls, geometric patterns, or extremely detailed public-transit maps. The spa also features a variety of facial massages, each of which can be customized to relieve pain, aid in relaxation, and improve skin tone.

Threading can be used to shape the eyebrows with a clean, defining edge. The procedure utilizes a length of thread, which is twisted back and forth along the hairs, which are to be removed. The twisting action of the thread traps the hair and lifts it out of the follicle.