If keeping it stylish, caL M and subtle is your style, the dark grey Muk Luks John Slipper is more than perfect for you! The combination of modern style make it easy to wear. Muk Luks John Slipper will keep your feet warm and comfortable all day long. These slippers come in S (8-9), M (10-11) and L (12-13). Hand wash in cold water and lay flat to air dry. Imported. Material: Acrylic, Polyester Faux Fur, Polyester.