Engelbert Strauss Windproof Waterproof Unisex German Boots Child size 3 EU 35
You can also replace with a thin shoelace, but kiddos tend to like ease of the current closure. US size 3 (big kids, not toddlers) / UK size 2.5 / EU size 35. Made in Germany; very well made. These boots are very hard to find in the US.