Size descriptions are inadequate. We bought some sheepskin slippers for our 2-yr-old who has a very well-understood shoe size (22 EU, 5.5 UK). Why, then, does Sheepskin World not follow this convention? In the end, we measured our wriggling son's feet, then chose a size higher... just in case. The result: still too small! We sold them (at a loss) to an acquaintance whose child is nearly 6 months younger. Problem is, our son is now dead set against this style of slipper, as we first had to force his feet into them when they first arrived, and he cried because they were clearly hurting him. Pretty poor, really.