Any helpful tips on buying Muck Boots for kids?
When it comes to children's Mucks, it's best to err on the side of a slightly larger boot or shoe size, and have kids wear thicker socks (or even two pairs). This way, as children's feet grow, they'll get maximum wear out of their Muck Boots before eventually outgrowing them.

Tips for Measuring a child's foot:
1. Have your child stand in his/her socks on a hard-surface floor, with their heels flat against the wall and their weight equally balanced on both feet.
2. Smaller children tend to curl their toes—be sure and straighten out all toes!
3. Use a pencil or piece of tape and mark the floor where the longest toe of the right foot ends. Do the same for the left foot.
4. Measure the distance between the wall and each mark and find the longest of the two measurements (one foot is usually a little longer than the other). Use the longer of the two measurements to determine your child's shoe size.
5. If your child's foot falls between two sizes, always go up to the next size, as children grow rapidly!
6. Remember—foot problems usually begin early in life. Never put your child in a boot or shoe that is too small.