Pack includes 4 pairs of U-shaped pants, each in a different color. Elasticized waist. U-shaped inseam leaves more room for baby's diaper. Soft cotton jersey, with comfortable stretch. Faux-denim french terry pants only: 51% cotton, 43% polyester, 6% spandex. Easy pull-on style. Old Navy 4-Pack Solid U-Shaped Pants for Baby