Not anything special, but they get the job done, so to speak. Bamboo is more sustainable than paper and it also holds together better when you are using them. 5 comfortably, so I decided on a 6. With these though thats not the case. Good good ?? Im debating on whether it is worth the hassle of re-dying them a darker color or tracking down navy blue polish, but for $50 I expect a little more. It comes with 3 or 4 foam backing pads to take up any slack you might have from a thinner phone/case setup. So I dug out two of my old ones to compare, and guess what? The new version was a completely different shape, much wider. The two I purchased in 2018 are working just fine so I had no problem purchasing this brand again this year. I highly recommend using the Birkenstock sizing chart.