Universal Textiles Childrens/Kids Little Boys Plain School Jogging Bottoms/Jog Pants (Open Cuff) Cotton, Polyester, Drawstring closure Great quality jogging bottoms for children. Ideal for school. Fiber: 50% Cotton and 50% Polyester. Machine washable. Jogging bottoms have elasticated waist band and they also have ties around the waist so you can tighten them.