S: (Recommended for ages 6 - 12 Months, Sole length 4.9 inches); M: (Recommended for ages 12 - 24 Months, Sole length 5.3 inches); L: (Recommended for ages 24 - 36 Months, Sole length 5.9 inches);;Cute starfish pattern on shoes, your baby will like it.;Shoes weight about 0.07 lb, Feet will not feel any burden. Even more important They are soft and comfortable.;Perfect for small feet at the beach and in water. Can also be used for new walkers and backyard playing around.;Waterproof neoprene material, Keep feet warm in the water; They float for easy retrieval; Stay on great, even in the water.