This gauge has been designed by Clarks to help you measure your toddler's feet with confidence, in the comfort of your own home. It is recommended for children with a Clarks infant shoe size 2 up to size 9 1/2, approximately from walking to the age of three. For older children or those with feet larger than 9 1/2 our Junior gauge is recommended. Each gauge comes with step-by-step instructions and an on-line video demonstration is also available. Further help and support is on hand in store, if required.