Sizing: Infant: 0-3 Toddler Extra Small: 4-6 Toddler Small: 7-10 Toddler Medium: 10-13 Toddler/Kids Large: 1-7 Big Kids/Womens 4-10/Mens 4-8 Sizes Infant/XXS, Extra Small, Small + Medium have logo grips on the bottom of the feet and size large have a stitched logo on the bottom of the feet.