- Birkenstock x Dior couple's global limited edition embroidered joint model. The joint product reinterprets two iconic Birkenstock items, TOKIO mules and MILANO sandals, integrating practical function and elegance to pay tribute to Mr. Dior's passion for gardening. Upper: Wool felt embroidered cowhide Back strap Sole: Cork midsole and EVA rubber backing Size: 35-45,