Sizing is way off.  Order at LEAST 2 sizes bigger than you normally wear.  For kids with growing feet, it wouldn't hurt to order 3 sizes up.  Since I had to keep reordering to get the correct fit for my 10 year old daughter, we ended up having 3 pairs to compare.  There is very little size difference between each size.  If you normally wear a women's size 10 or 11, don't even bother -- they will be too small.  Other than the considerable size issue, they seem to be fine.