I’m the original owner. I wore these once, for 50 minutes total (walking to and from a place; I changed into dress shoes when I was there). Comfortable. They have non-slip soles with treads. There’s some arch support. Roomy toe box, so good for wide feet too. Easy to clean. Based on other Crocs shoes on their website, I think the material is thermoplastic. In any case, I think it’s the standard Crocs material. These only came in whole sizes, but I read lots of comments about how they can be reshaped with heat (like using a hair dryer) to get them to your exact size if you’re in between. Note: In the photos, there are some scuff marks (like in the shot of the heel cups), but these were just dust (or something like that)—I only saw them in the photos and was able to wipe them away after. I don't see any flaws. Size 9 Insole: ~10-3/8”L (from front middle to back middle inside, measured flat along the insole) SFPF