Twisted headbands/scarves are one of the latest hair trends. I've seen a ton on Pinterest and I think this is a trend that will transition from summer to fall. They look super cute and chic. It's a good style that is easy to do for work, running to class, or just hanging out.
These are some styles I found on Pinterest. I like how each girl is wearing it a different way. They were all linked to Etsy, where you can purchase them!