Without testing the hair, it is unfair to say that our hair is mixed hair. First of all, we never sell hair mixed with synthetic fibers. We only sell 100% human hair. Secondly, you can test your hair by burning it. Human hair will look like ash after burning, while synthetic hair will look like clumps after burning. We also support you to take our hair to an authoritative agency for testing. As what you said, the hair that can't hold the curl, that's because the curling iron you use to curl your hair is a one-time curl, and you need to apply styling agent to maintain the curl. Even if our own hair is curled with a curling iron, It doesn't last for more than a few hours and has to be maintained with a hairspray. This is why we need to go to the barber shop to perm our hair if we want long-term curly hair. Why our water, deep, and kinky hair can hold the curl for years is because curly hair requires styling agents.