Hi Mark, Human perfling ... done properly, takes a skin graft from under the souls of the feet and grafts it in a thin line around your head, about a quarter inch from the hair line. Advantages... if you bump your head your scalp will be less likely to slip off... disavantages, in hot weather your head smells like your feet.
I frankly would advise against it, as it is very rare that a bump on the head results in the scalp slipping off.
Good luck and think twice about human purfling...
Larry