- BIRKENSTOCK/Birkenstock Toe-Toe Half-Flop This classic toe-toe half-flop features an elegant large metal buckle. Comfortable and easy to wear. The lining of the semi-delicate insole is covered in soft smooth leather that matches the color of the shoe. The upper is made of Made of high-quality, soft natural leather. Upper: suede Sole: cork midsole and EVA rubber backing Size: 35-45,