Coil Hair Ties for Thick Hair, Ponytail Holder Hair Ties ... 2.Waterproof, Smooth and Hygienic:The spiral hair ties are made of TPU material, non-absorbent and oilproof, they can be worn while swimming or bathing without that "nasty wet hair tie" feeling, and they can be removed from wet hair much more easily than a traditional ponytail holder.The hair ties coils' texture makes it more hygienic than ...