I would get a foil over a cap personally. A cap is cheaper, but I dunno - I just was never thrilled with the results. In the cap method, you brush out the hair, stick a plastic cap (think snug little ol' lady rainhat w/ a tie under the chin lol) on that has holes in it. Then the hair is pulled through the holes using basically a crochet hook. I don't like it because depending on how you brush the hair before you put the cap on, it can look totally spotty after it's bleached. Sometimes too much hair is pulled through, ripping the cap and having a section that is much thicker than the rest. Plus after the hair on the cap is bleached, washed, and rinsed, it's a giant knot. Not a lot of fun to try combing through.. then attempting to get the cap off. lol Foil is better, you can get the exact thickness you want, it's more of a consistant result, and usually pain-free! lol If you can afford to pay a little more for foils.. .go that route.