20″ of beautiful, curly, virgin, red hair. It measures 4" thick. My son is 13 years old, his hair is conditioned, he also uses a leave-in conditioner, and his hair always air dries. He has never used any flat iron or heat of any kind. He is a non-smoker, and is never around any smoke. His hair has not been cut yet, but can be cut within a few days of purchase.