Sisal, raffia, and even paper (there's also a faux one or two in the mix)! I'm loving these pillows that would look great in a sun room or by a pool. Can you put them in order from least to most expensive?! The source list is below and I put the answer in the comments.
1.via 2.via 3.via4.via5.via 6.via
Most of the pillows came in multiple sizes so I let the price of the smallest pillow determine the lowest price.