There are a couple of things to note. On the adidas website, sizing was the chief complaint. I wear a 6.5 in heels, 7 in most ever other shoe except for Hoka Mach 5s (where I wear a 6.5, but a 7 in Cliftons). Not sure what size to buy, I based my choice off of the only adidas boot I could try on locally--their regular hiking boot (6.5 fit me). I went half a size up from there and they fit perfectly. If I'd followed the advice in the comments on the adidas website, I would have gotten a 7.5 and it would have been too big. Additionally, the uppers are stiff to provided support and stability. If you have slim to normal ankles it's fine. Thick ankles won't fit. Finally, these are best for people with feet shaped like mine, wide at the toes with a very narrow heel