(1021637) Mogami HL Sandals - MidnightMogami HL Sandals by Birkenstock Kids. The perfect play sandal for kids and their everyday adventures! Totally waterproof. Incredibly durable. And, of course, wildly comfortable. The BIRKENSTOCK Mogami features a waterproof synthetic Birko Flor upper, hook and loop straps and a contoured PU footbed for Birkenstock comfort and support. Anatomically shaped footbed Upper: synthetic birko flor Footbed lining: polyurethane (PU) Sole: polyurethane (PU)