Iles Formula Signature Hair Tie The Iles Formula Hair Tie is a limited edition gift offering for the holiday period. The Iles Formula Signature Hair Tie is a collaboration with Hermes award recipient, Nomie Lacroix, a French artist at the Spaceless Gallery in Paris. Lacroix has taken the Iles Formula identity and transported it into her designs on silk made in Lyon, France. Wear as a hairband or hair tie, around the wrist, or on your handbag as French women tend to do. Our Signature Hair Tie.