The Chaco Kids ZX/1® EcoTread™ Sandals are a slip-on featuring a double-strapped webbing upper that provides superior comfort and durability for any kind of daily activities your kids can come up with. The LUVSEAT™ footbed cradles every muscle and bone in your child's foot to ensure superior performance that is long-term. The non-marking EcoTread™ outsole is a rubber that contains 25% recycled material. What does this mean? This means even though your kids will try they will probably not mark the floor.