- Size: 38-39 • Elegant design: the combination of the synthetic alpaca upper and the fluffy collar makes our slippers layered. The shiny metal buckle enhances sophistication. Its slip-on design increases ease of use and is suitable for all seasons. • Comfortable materials: the soft synthetic alpaca upper and lining keep your feet warm and comfortable. The additional synthetic wool collar adds overall warmth, giving you double comfort. • Memory foam: with a high-density memory foam insole, these slippers conform to your foot for all-day comfort, helping to prevent fatigue and pain. The additional cushion enhances walking stability. • TPR non-slip sole: with a textured non-slip sole, it meets your needs both indoors and outdoors. You can wear them to relax in your bedroom or fetch your mail outside the house.