Decided to try these after hearing they leave no creases or dents in your hair when you do bun heads regularly. Since I wear my hair long and in a bun often I needed to try them. They do exactly what they say and allow me to wear my hair down with waves after being in a bun. But they do stretch out like normal elastics do. So just put them in a bowl with boiled hot water and they shrink up again! Love them..