NIKE Boys Cool Hbr Compression S/S Youth (Little Big Kids) 92% Polyester/8% Spandex Imported Machine Wash Compression fit keeps everything tight to the body for maximum support during high-performance activity. Dri-Fit technology helps keep you dry and comfortable/Mesh back panels for breath-ability. Ergonomic seams and vented hem promote natural range of motion. Flat seams move smoothly against your skin as you train. Crew neck/Short sleeves/Swoosh at center chest./Shirttail hem with split sides.