Rubber soleFEATURES: ROXONI Women??s House Slippers are super comfy and are designed with an Ultra Comfort and Quality Fleece Insole; and an embossed Non-Skid outsole to provide an easy and safe walk with plenty of Support.VERSATILE: Great for indoor and outdoor use, all year round. Very Lightweight Lounge around the house with them or Walk the Dog and stroll down the street .COLOR & SIZE AVAILABILITY: Colors every Woman will love: Available in three classy colors: Blue, Black and Wine. Available in a range of sizes to fit everyone. All Man made materials.MACHINE WASHABLE These Slippers Are easy care and easy to Launder; they come with instructions how to Wash them with the Washing Machine.SATISFACTION GUARANTEED: Satisfaction of our customers is our primary concern. If you are not happy with your purchase, feel free to contact us; we will do our best to meet your needs. We offer a 100% money back guarantee on our entire shoe collection, so that you can enjoy a risk-free purchase.