EASY STEP-IN MULE DESIGN: The backless mule silhouette allows for quick, effortless slip-on and off wear, perfect for instant comfort around the house. Sizes 3 4 5 6 7. ULTRA-SOFT PLUSH COMFORT: Crafted from soft textile fleece with a luxurious plush faux fur collar, sock, and lining for a cloud-like feel and maximum warmth.