Children's sandals LOAP SIMMA JR. SIMMA JR children's sandals will come in handy while your kids are downtown, or on a simple trip to a castle. Their two Velcro strips make them easy to put on, and the soles are made from thermoplastic rubber that wears down less than standard materials.- material (upper): PU Nb- lining: tricot- midsole: microfibre- outsole: TPR