I have these extensions ordered for carnival last year. Have you worn frequently during the period. Was also very satisfied. Hair color has fitted perfectly. After that it was about time for a wash, so I washed them by hand. The result was unfortunately very disappointing, after that I had very smooth rather than wavy hair. The curls were out completely. Now the Carnival season begins again and I have dug out again. Smooth I did not want it, so I have something rumgetestet. The curling iron is not about unfortunately. I've googled a bit and lo and behold, a great tip found. I have to say that it probably will not work with all plastic Extensions. Everyone must of course be decided whether he wants to risk it. It can also go wrong. But there is in the product information that the extensions may also be doctored and they are made of 100% Kanekalon ... I have worried me curlers, the hair turned up, doused with no more boiling water, left there for 2-3 minutes and then Allow to dry for the heating. In with it worked great. Now I have great curls again and am super to peace that I can not bear another year! Would she get me definitely again, if it should not survive this year :)!