TIY is the first customizable hair tie on the market. Created to fix the never ending issues of your current pony tails. Does it stretch out? slip? Dent your wrist and mark your hair? TIY WON'T. It took us 1 yr and 1/2 to get the material right, the durable elastic is designed to keep hair confidently secure without slipping, retaining shape and stretch for months after use compared to similar products. It doesn’t dent or crease hair like regular hair ties often do, and it also helps prevent hair-related headaches.