After wearing them around a while, I noticed a material warning on the bottom of the box that says: Warning materials in the product are known to cause cancer, birth defects and other reproductive harm...WHAT? Like from being ingested or from wearing!?!? I don't know for sure, im guessing it's if you eat...Strange though. Otherwise they fit me well as an 8.5 and I typically wear an 8, so a half size up may be a good idea.