This is Alphax's "Sliet" slippers, designed to improve core strength. The color is white. I'm selling these because I no longer need them, having achieved leg slimming results after using the same pair for six months. The special angled sole encourages you to shift your body's center of gravity backward. This engages your lower abdomen, hips, and calves, strengthening your core and improving your body line. The three-dimensional insole fits your feet and is designed to prevent slipping and reduce fatigue. Suitable size: 23.0-24.5cm.