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