Purchased a second pair of Pediped Sahara Flex after my daughter outgrew the pair she wore all last summer at daycare and on the weekends.  I'm a firm believer in investing in high quality shoes, and these are worth the cost. Super flexible while being supportive and durable.  Like last year, I purchased a size up (22, though 21 is a perfect fit) in the spring, so that they will last into the fall. Even with plenty of room to grow, these sandals are still stable on her feet because the strap cinches right near her ankle. And they're washable!