* Alopecia areata: Duritz has spoken openly about his struggles with alopecia areata, an autoimmune condition that causes hair loss. This condition can cause patchy hair loss, which is why he has areas where his hair is short or absent. He's mentioned that the hair loss comes and goes.
* Self-consciousness and covering up: It's reasonable to assume that, at least initially, he may have styled his hair in a way that helped to mask the effects of his alopecia.
* Personal style: Over time, his hairstyle has become part of his personal style and recognizable image. He may have embraced the look, even as his hair loss has evolved.
* Practicality: The style may be practical, given the unpredictable nature of his hair growth.
In summary, a combination of a medical condition (alopecia), a desire to cover it, and the development of a unique personal style likely all contribute to Adam Duritz's distinctive hairstyle.