I had a broken foot recently for 6  months ( still not healed). I was looking for a low heeled comfortable boot,since I haven't been active for the broken foot period,my back would really start to hurt with activity. I know crocs have a reputation for comfort,the only shoe my 6 year old finds comfortable too. He has big feet. So I ordered these and the Shorter style with the fur(love,love,love those too) so I am very happy with these. I always read reviews before I buy,thats were the confusing sizing comes in.  The 10 was out of stock so I went with the 9. I am usually 8.5 ,sometimes 9. These in a 9 worked for me like a normal fit. I will say that a super thick sock would be a bit snug,but,i wear regular socks with the both boot style because the lining keeps my feet warm enough for what I need,errands dog walks,etc. Although the other shorter boot in this style with the fur I think is warmer! All in all,sizing is really confusing with so many conflicting reviews! My normal croc size 9 worked for me,10 was big. I have a fairly average size,shape foot. If you can order both sizes and return one,i would reccomend that! I did that with the shorter fur one,since  reviews there were mixed about size as well.