Half slipper. Half sock. They also have a soft brushed lining on the inside to keep you toasty, and special grips on the outside to help prevent slipping Size: S (US Shoe Size 7-8.5) Materials & Care Outer, 50% Acrylic, 30% Nylon, 20% Wool, Lining, 72% Rayon, 22% Polyester , 6% Spandex, Silicone Gripper