Removable elasticized backstrap on sizes 3/4 Infant, 5/6 Infant/Toddler, 7/8 Toddler and 9/10 Toddler ONLY ensures a snug, secure fit.Synthetic upper is comfortable and durable.Compression molded EVA footbed with anatomically-correct arch support.Durable rubber outsole for traction.Measurements:Weight: 3 ozProduct measurements were taken using size 9/10 Toddler. Please note that measurements may vary by size.