As cozy as your favorite slides, as supportive as your favorite sneakers; that's our Energy Return slippers! Each step offers a bounce-back effect to take stress off your feet, ensuring you stay comfortable all day long. Size Guide for Men's Shoe Sizes - S - 7-8, M - 9-10, L - 11-12, XL - 13-14. If your measurements are in between those listed, pick the next larger size. Genuine suede upper with tie detail. Plush lining and comfy recycled fleece footbed. Memory foam insole adds extra comfort. Easy on/off silhouette with indoor/outdoor outsole. Energy Return insoles feature high-density foam and energy return pellets that provide comfort and bounce with each step.