This is a fun and easy style to do, and it's great for summer because it keeps hair up and off the neck/face/shoulders.
To begin part the hair down the middle front to back and pull 1 side out of the way while you work.
Take the half that you are working with and divide into sections going back. If you are trying to keep bangs off of a face like I am you can pull the first section with bangs directly into the next section.
Take the front section and start twisting until you are past the next elastic.
Add the twist into the next elastic and comb out the hair.
Continue all the way back on both side so you have two sets of twist braids. Ta Da!
View from top front so you can see that I took her bangs directly to the second section without twisting them.
Another view from the front: