Women's 1/2-Zip Running Top. AN ESSENTIAL MIDLAYER. The Nike Pacer Top sets you up with a smooth, updated design for your run. Built for movement, the top features an all-new watch window so you can quickly check your mileage on the go. This product is made with at least 50% recycled polyester fabric. The material comes from plastic bottles that Nike has diverted from landfills since 2010—bringing Nike's total to more than 6 billion. Updated sleeves feature a watch window so you can keep track of your miles on your device. 1/2-zippered design lets you adjust the airflow. Dri-FIT technology helps you stay dry and comfortable.