- Baby – XS (46cm): Up to 12 months
- Toddler – S (50cm): 12 months – 3 years
- Kids – M (54cm): 3 years – Teen
- Adult – L (58cm): Adult
*Children’s head sizes can vary greatly so these are approximate sizes only. To be sure, it’s a good idea to measure your child’s head; with a piece of string or soft measuring tape simply measure just above the ears and across the forehead where the hat band would sit. If using string, you can lay it on a ruler or hard measuring tape to find out the length.