what density to order depends greatly on how thick your side/back hair is......you see, you could put a thick piece on top but it wouldn't blend well if you have very thin/diffused sides. so it greatly depends on your own hair. if you have good sides, you should probably get 65%-70% density for the zac efron look. ....but that is just a guess as I haven't seen you to give you a more educated opinion.
the look you are going for is very easy to achieve with a hair system though.....so go for it!! you won't regret it. read the forum as much as possible to learn all you can about this!!
DebbieS.
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