Clarks Foot Gauge Size & Fit Measures feet from Clarks' infant shoe size 10 (approximately aged 3), to adult size 10 Details Junior Foot Gauge by Clarks White/Green Designed to help you measure children's feet from home, with confidence See our handy step-by-step video guide above, to help you find the ultimate fit with Clarks! For further guidance on measuring your child's feet from home, we have a video tutorial, PDF guide and Q&A section - all available to view on our Clarks brand store Recommended from approximately ages 3 and up For younger children or feet smaller than infant size 10, please see the Clarks Toddler Foot Gauge (item number 73NT6) Please note: This foot gauge is non-returnable If you are unsure of their shoe size search 'Clarks size guide' in our search box for a step by step guide.