Nike LAB x SACAI Track Pants Women's Navy Blue XS BNWT $300 The Nike pants is perfect for working out in the gym or taking a class. Fabric: Body: 100% polyester. Stretch rib fabric in back for warmth and a soft, flexible feel. The easy-care fabric is crafted from cotton, spandex, polyester, nylon for lasting performance and comfort. Side pockets. Brand new with tags.