Our Baby / Toddler T-Bar Shoes are made of premium quality suede leather with a t-strap cut out plus adjustable buckles. ? Made of PREMIUM QUALITY GENUINE SUEDE LEATHER. ? THE SHAPES OF OUR SHOES STAY. The structure won't collapse. ? Durable Soles: Size 1 we use 100% Suede Leather Soles. From size 2-4, and 6 we use Wavy pattern non-slip full rubber that is Weatherproof. Size 5 come with diamond pattern rubber plus suede leather. They are all Soft, flexible and good for foot development. From size 6-11, we have options of hard-soles made of rubber. The hard-rubber soles are 1/4 inches high. ? 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 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 my Chart. Refer to the Insole length column. Then pick the size based on how much growing room you'd like to add.