Quarter-strap styling defines a classic sandal built on the legendary Birkenstock footbed for time-tested comfort and fun-to-wear style. Every Birkenstock features a deep heel cup that promotes correct weight distribution and foot alignment, along with a contoured footbed that adapts to the unique shape of your child's foot. Style Name: Birkenstock Rio Sandal (Toddler & Walker). Style Number: 5964343.