This athletic trainer features the Flex Fit System™ which provides additional inserts that can be inserted for a snug fit then removed for room as your child\'s foot grows. These inserts can reduce shoe size by almost half a size, extending the life of the shoe. Machine washable, these shoes are perfect for the playground and are easy to keep looking clean and smelling fresh! Man-made material upper All natural rubber sole Breathable mesh lining - - - Light, athletic trainer with maximum flexibility Breathable mesh upper Machine washable