These watch straps are compatible with the Fitbit Ace. They are also compatible with the Fitbit Alta.
The Fitbit Ace is a great mode for Kids, and comes in a range of styles and colours.
Fitbit has since updated this watch with the newer Fitbit Ace 2.
If you're not sure what straps are compatible with your Fitbit, check out our extensive compatibility guide here.
Fitbit's official website can be viewed here