I'm selling these because my son has outgrown them. They're recommended for middle school boys whose waists are still a bit loose in adult clothing! There's no size label, but I believe they are a size 160 to 170. For reference, my son, who is 170cm tall and weighs 50kg (a slightly slender build), used to wear them. The waist is 66cm, and the inseam is 76cm. The waist is elastic, and only the zipper part opens and closes.