Dockers Men's Slipper Boot with Warm, Synthetic Sherpa Lining Polyester Imported Synthetic sole ANKLE HEIGHT: Keeps feet warm up through your ankles. WARM LINED: Soft, Synthetic Sherpa lining holds warmth EASY ON, EASY OFF: "No Lace", two-eye pattern allows for easy slip-on and off MEMORY FOAM CUSHIONING: Memory foam conforms to your feet for comfort and warmth INDOOR-OUTDOOR: The bottom of the shoe is made for indoor and outdoor use.