My ds age 9 has size 5ish feet but always has to go up a size in shoes to accommodate his high arch. I have tried so many snow boots on him and none of them fit. (Or he can't get them on) His brother's Russell and Bromley size 6 seem good (which I got about 3 years ago) but I'm not sure if they do them any more. I know, I should get more for the brother, but it's not easy to find a size 6 either! Anyone got any ideas?