The Iconic Tulip Shoe By Ilse Jacobsen Hornbæk. The Upper Is Made Of Recycled Microfiber With A Decorative Laser Cut Pattern Attached To Our Iconic Tulip Outsole, Made Of 75% Natural Rubber And 25% Recycled Rubber, With A Colorful Dotted Effect. The Upper And Outsole Is Connected By Using Matching Colored Recycled Thread, Using No Glue. The Insole, Lined With Pig Suede, Has Padding And Support, Ensuring Great Comfort.