Ilse Jacobsen Hornbaek Tulip Flats in Gunmetal (dark metallic) Made from recycled microfiber with a laser-cut pattern Super comfortable with soft, pig-suede lined insole. Great preloved condition. Recommendation from Ilse Jacobsen about the Tulip Flats - Go one size down If you're between a size 39 and size 40, they recommend you buy a size 39. Size: 39