Each brand has a specific sizing guide. Please see the sizing guide for Common Tread below:
HOW TO MEASURE FOR KID SIZE CHART
1. Place a blank piece of paper on a flat surface. The paper should be big enough for your child's foot.
2. Have your child stand barefoot on the paper, with their heel against a wall. Their weight should be evenly distributed and their foot should be flat.
3. Mark the paper at the end of your child's longest toe with the pencil facing slightly inward.
4. Use your ruler to measure the length.
ADULT SIZE CHART