They have a profiled insert.
When selecting a size, use the size chart.28-17/29-17,5/30-18,5/31-19,5/32-20,5/33-21/34-21,5/35-22cm Big Star children's slippers are made of high-quality plastic resembling foam. These lightweight slippers will be the perfect shoe for your child! The movable strap prevents the foot from slipping..