Yes, those guys could wear hear if they shaved the fine thin hair off there heads where the hair system would be applied. The reasons for shaving the thin hair off is twofold. First, the bases are translucent and allow the color of the scalp to show through for realism. So any hair left unshaved would be visible under the base. Second, you get a stronger bond if there is clean skin to attach to. All knots are bleached at the factory. Some suppliers only bleach knots at the front of a unit. We bleach all knots.
Regards,
John