Tulip open slippers by ILSE JACOBSEN HORNBÆK. The upper is made of recyled microfiber attached to our iconic Tulip sole, made of 75% natural rubber and 25% recycled rubber, with match colored recycled thread, using no glue. The slippers is lined with soft faux fur consisting of 100% polyester. The insole, lined with pig suede, has padding and support, ensuring great comfort.