I used cold caps and lost my hair after a nurse didn't check the machine properly. Still, I kept it for 3 months and it started to grow back. If I could go back in time, I would have gone without it and listened to music instead. It added a lot of time to my treatment and not being able to hear very well was a bit isolating. I did have very fast regrow he after chemo and have retained my thick hair. This is going back 2 1/2 years ago, so things have probably improved since then. I used the new style machines.