The hole in the shoe where the child's foot is inserted is not flexible. Our son's feet are wide so we had to shorten the strap to fit them. They pass water well, but collect rocks in the holes in the soles of shoes.
Flexible Comfort: pediped Flex Isabella Mary Jane for Toddlers and Little Kids
47 Review
Stylish and Comfortable pediped Flex Estella Mary Jane Shoes for Toddlers and Little Kids
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Capezio Girls 3800 Mary Jane Tap Shoe in Caramel - Size 11.5 M Toddlers
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Dance in Style with Molly Jane Tap Shoes: Unisex-Child Mary Flats
50 Review