Acorn Casual Versa 2-Way Fleece Slipper Socks 2-Pack 100% Polyester Machine Wash Cold Moisture-wicking fleece surrounds your feet with soft, breathable comfort. The slippers are made with two-way stretch fabric to give you a flexible fit. Flat-lock seams are smooth against your skin. The mid-cut height keeps the cold from nipping at your toes and calves.