Herring Glen rubber-soled slippers in Black - Herring Sale. We are delighted to introduce the Glen mule slipper. It has a rubber sole for grip, luxurious sheepskin lining for warmth and soft suede uppers in an amazing value package. Upper: Suede. Sole: Rubber-soled. Features: Casual styles, Slip ons, Rubber-soled, handmade, Slippers, Warm lined, hand-sewn, Mens, mule-slippers, Slippers. Herring Shoes Glen rubber-soled slippers