These are denim pants with an elastic waistband. The size is 120, but they are slim-fit, so they have only been tried on and not worn. I bought them for a girl, but they are simple denim that can be worn by a boy as well. Please note that I have blacked out the name written on the back of the tag. (See photo 4) - Brand: ELFINDOLL Nishimatsuya - Size: 120 Pant length... Full length