The natural characteristics of human hair are determined by the amount of sebum produced in the sebaceous glands near the scalp. To this is added the impact of various chemical and other treatments and processes undergone by the hair. Heat styling, color and perm, all have an impact on the hair’s characteristics. It is important to determine your hair type before choosing the human hair extensions which match you. The hair you have dictates the human hair extensions and their treatment. Fine, curly hair ought to be exactly trimmed so that it can be controlled better. Thin, fine hair with a straight texture can be layered for extra lushness. Thin, wispy hair has to be kept short and must not be grown to become too long. A bob-style can make medium, straight hair look curly and full. Thick and strong hair can be cut to mid-length with the frizz eliminated using a wide-toothed comb. To re-set the curls, style the hair when it is wet. Other than the texture, differences also arise among hair types depending on the quantity of sebum. Based on this, the hair can be classified as oily, normal, dry, and frizzy or fine. Human hair extensions of colored hair are more porous than virgin hair and need to be treated with more care and gentleness.