These are health slippers that train your core just by wearing them!! I bought them and tried them on, but they were a little too small for me, so I'm selling them. They are about a size M!! I bought a larger size and wear them while doing housework indoors, and my calves and thighs get sore, which makes me feel like they're working!! - Color: Black - Material: Rubber - Design: With embossed logo - Style: Open-toe Thank you for looking.