Like a thick and cozy sweater for your feet, these Muk Luks slouchy knit slipper boots feature stylish homespun touches and a height that keeps both your feet and calves warm and toasty on cold winter days. Indoor/outdoor booties have 13"H, soft 100% acrylic knit uppers with luxurious polyester fleece lining and faux suede side wall accents. Comfortable foot bed is foam padded, and the stretchy ribbed collar holds the slipper in place, whether you wear it tall or slouch it down. Sizes S (5-6), M (6-7), L (8-9), XL (9-10). Machine washable.