I was worried about buying this because it had no reviews, but this boot is excellent! I'm a size 8.5 or 9 in US sizes and I got the 40 and it fits perfectly! Plenty of room for my toes (but not too much) and the ankle is stretchy so it holds very well! It's got a solid structure to it and great grip. I haven't tested the waterproof on this so I can't say anything about that but it does have a waxy coating so I expect it'll be fine. One thing I wasn't expecting is the slight heel on this boot. It's not much, but enough to notice! I love these.