When I first tried these, I was disappointed that they stretched out too much after maybe 2 weeks. Then I read that I should wash them, and that worked to restore them. I don't know what kind of knot is recommended as the video is way too fast to follow for 64 year-old eyes and there is no diagram, so I just used grapevine knots, which work fine. I tried finding similar elastic in the local stores, but no luck, so I'm back to TIY. I wish they lasted longer before having to wash them (I think they got lost in the washing machine), but so far, they're the best hair ties for my long, straight, fairly thick hair.
I was so happy with them! the first run in the TIY hair ties I did 18 miles and had no hedack no slip just amazing! (I now need every color)
I'm a guy with long thick hair that plays active sports. These ties have been the best I've ever used. My hair has never fallen out of the bun while playing. I love the colors that are offered because I can use the black ties for nights out and have another color for when I workout. These are a must buy.