I've been seeing a lot of caps such as this one that the woman in the video is wearing. If you don't want to alternate pieces of hair with foil, the cap is an easy way to apply bleach to your hair. There are other benefits of the cap process other than ease of use. You can better see how the bleach is taking to your hair. There are downsides to the cap highlight process. This isn't a good method if you want a more unique look. The cap is better if this is your first time doing highlights at home or if you're doing a root touch-up.