NIB. Color:Summer Floral Light Rose Birko-Flor™ Birkenstock sizing 37 = Women's size 6-6.5. I normally wear a size 7 and these fit perfectly. Walk in comfort with the fun Birkenstock® Gizeh Vegan. The foot-bed molds to the shape of your feet, providing you with overall feet wellness. Birko-Flor™ upper is made of acrylic and polyamide felt fibers, this material is a soft fabric with a smooth leather-like finish. EVA outsole offers lightweight, shock absorbing support. Slip-on style has synthetic upper straps with textile lining underneath.