Nike Boys Cool Hbr Compression 3/4 Tight Youth (Little Big Kids) 90% Polyester/10% Spandex Imported Machine Wash Compression fit keeps everything tight to the body for maximum support during high-performance activity. Dri Fit technology, which draws sweat away from the body for a cool and dry wear. Strategically placed mesh in high-heat zones for excellent breathability. Ergonomic seams for enhanced range of motion/ Elastic waistband. Flat seams move comfortably against your skin as you work out.