Nike Boys Cool Hbr Fitted Long Sleeve (Little Big Kids) Imported Machine Wash^Tumble Dry Dri-FIT Technology helps keep you dry and comfortable. Mesh back panels provide breathability. Flat seams move smoothly against your skin. Ergonomic seams and underarm insets allow natural range of motion. Fabric: Dri-FIT 92% polyester/8% spandex.