Clarks designed this gauge to help you measure your child’s feet with confidence, in the comfort of your own home. It is recommended for children with a Clarks shoe size 13 1/2, approximately the age of three, up to adult size 6. For younger children or those with feet smaller than infant size 13 1/2, we recommend our Toddler Gauge. Each gauge comes with step-by-step instructions and an online video demonstration is also available. To find your child's Clarks shoe size from the measurements taken from your foot gauge click here.