Groovy Uk Sonic class of 91 Adult Mule Slippers are made from polyester material. Soft feel fleece. Slippers will be sure to keep your feet warm and toasty. Ideal gift ideal to gift your friends and family. Beautiful and eye-catching design. This is super soft and comfortable non-slip sole slippers. 100 percent officially licensed Sonic. Size: 8/10 UK. Comes in black/blue/white colour.