Our Baby / Toddler Mary Jane Shoes are made of premium quality leather plus adjustable buckles. ? Made of PREMIUM QUALITY GENUINE LEATHER. ? THE SHAPES OF OUR SHOES STAY. The structure won't collapse. ? Durable Soles: Size 2-6 - Non-slip Diamond Pattern Rubber Soles plus Suede Leather . They are SOFT, FLEXIBLE, and Good for foot development. Size 5-10, we have option of Hard Rubber Soles that's 1/4 inch in heel height. ? SHOES STAY ON BABIES' FEET. Adjustable Buckle and belt closure on the sides. ? COMFORT - Cushioned Collar Padded Insoles for walking outdoor. ? SAFETY ARE OUR TOP PRIORITY. The materials we use are audited and safe for children. Please refer to Sizing Guide Photos for sizing help. Make sure to add at least 3/8 inches (or 1 CM) of room for baby's foot development. Age is for references in general, it's recommended to measure the kid's foot plus 1 CM and pick the size accordingly. Hard-Sole Shoes might be 1 size smaller than many retailer sizes. ?Another way to figure out the shoes size is by measuring the bottom of your kid's current shoes, its Sole length. You can measure it from top to end of the shoe sole and compare with my Chart. Refer to the Insole length column. Then pick the size based on how much growing room you'd like to add.