Birkenstock Betula Vinja Black Patent Criss Cross Sandal Size 37 New but a couple smudges to footbed Contemporary design meets classic comfort in the cute Betula® Licensed by Birkenstock® Vinja soft sandal. Easy slip-on with thong construction and flat toe-post. Crossover straps with brand-button detail. Birko-flor™ synthetic upper features a soft felt backing for comfort. Smooth synthetic lining. Leather-lined footbed creates a naturally ventilated environment for your feet. Signature cork midsole provides superior support for the four main arches in the foot