- These are boy's jeans. They're slim fit. They're made in Indigo Knit. They have a zip fly. It's a classic five-pocket . The model is wearing a size 152 and is 158 cm tall . JACK & JONES JUNIOR Check out our special Indigo Knit fabric? It's a special fabric that combines the superb comfort of knitted sweatwear with the authentic indigo look of denim. In a pair of Indigo Knits, you'll look sharp. But you'll also feel just as comfortable as you do in a pair of sweatpants.