ROOMY COVER-UP FOR STAYING WARM. The Nike Yoga Top is a warm, loose layer to keep you comfortable on or off your mat. Soft French terry fabric (made with at least 50% recycled polyester fibers) wicks sweat to keep you dry and has a soft knit feel. Longer in the back for more coverage as you bend and stretch. Hem vents allow flexibility and airflow. Loose fit for a roomy feel. Complete with triangle stitch at neck and ribbed cuffs.