At City Eyebrow Threading Salon, overstuffed pink chairs face full-length mirrors hung on deep-violet walls. In a way, the bold decor reflects the stylists' no-nonsense approach to beauty: During one of their most popular treatments, eyebrow threading, a technician uses a fibrous thread to pluck unruly brow hairs one by one. The result is a clean and defined arch that helps accentuate your eyes or distract attention from the swimming goggles you forgot you were wearing. You can also amp up your eyelashes with Blink lash extensions, which add natural-looking length and volume.