i dont think it comes with more hair or whatever, a few years back i wiped out on my bike and like ripped off all the skin on my upper forearm and elbow and the hair grew back there in about a month, its the same thickness and length and everythings else as the rest of my arms hair. and ive burnt off hair from my arms before (that what happens when u r bored and on summer vacation) and it grew back fine in about a month or so