Afterpay Available - The signature slip-on clog from BIRKENSTOCK - the Boston. A casual-wear staple that is perfect all year round with a simple, adjustable design and contoured cork footbed that forms to the shape of your foot. The color-coordinated outsole rounds off the shoe's look of sophistication. Available in vegan materials including an upper made from the skin-friendly, hard-wearing synthetic material, Birkibuc.