<https://www.activator.com/product/chiropractor-accessories/adjusting-shoes-child/#product>
<http://schema.org/description>
"These universal fit shoes with flat bottoms can be used for either left or right foot, and are designed to help ensure accuracy in your Activator Methods Leg Length Analysis.  These shoes are to be used for patients wearing boots, sandals, or shoes with worn soles, by removing the non-conforming shoes and placing the Adjusting Shoes directly on the foot. Not designed for walking in or for therapeutic use.  Child size universal fit for all children size feet.  (Available only in black.)"
<https://www.activator.com/product/chiropractor-accessories/adjusting-shoes-child/>