Our Baby / Toddler T-Bar Shoes are made of premium quality leather. ? Made of PREMIUM QUALITY GENUINE LEATHER. ? THE SHAPES OF OUR SHOES STAY. The structure won't collapse. ? Durable Soles: leather plus diamond grip pattern non-slip rubber. Soft and flexible that are good for foot development. ? SHOES STAY ON BABIES' FEET - Easy on and off Hook Loop 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 3/8" and pick the size accordingly. For example, some 7 months old baby girls are still in size 2. Some 18 months old boys may wear size 5 to 6 already. ?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 our Chart. Refer to the Insole length column. Then pick the size based on how much growing room you'd like to add.