Very odd sizing. These are the next size up from our child's previous shoes, which were suddenly outgrown, however they are huge! No exaggeration. Even with socks, which would not be worn with sandals, unless the socks were an inch thick. So they had to go back. Very disappointed at the inconvenience of having to send back and wait for a new pair of a different style shoe. Definitely not the normal experience with their products. Fortunately, Pediped has great customer service, so we will continue to shop with them without worry. However, do not buy these unless you plan to tuck your child's feet in 1 inch thick socks, too, hah! — for Grip 'n' Go™ Gustan Grey/Orange