NIKE Mens Black/Dark Grey Tracksuit Zip Up Top 100% Polyester New Nike Mens Black/Dark Grey Tracksuit Zip Up Top Size XL (UK 46/48). This brand new Nike Tracksuit zip up top is made out of a combination of polyester and cotton, and is machine washable. It features a black polyester front panel with a contrast dark grey polyester panel on the shoulders, and a contrast dark grey cotton collar, sleeves, side panels and back. Also features 2 side zip up pockets, a zip fastener, ribbing on the elasticated cuffs and waist, and a small embroidered gold Nike logo on the left side of the chest.