Men's sexy bikini open-back pants. The size is free, and the color is black. The fabric is thin and soft, and see-through. I think it feels good to wear. The back has thin strings, and you can adjust them to fit your buttocks or make them dig in, making it very sexy. Although it's free size, the flat waist measurement is about 34cm, so it's probably equivalent to a size M-L. The model photos show the front pad, but it is not included with this product, so please be aware of that. How about it for everyday use or playing with your partner?