Speedo 7050600 Men's Aquablade Brief 65% Nylon/35% LYCRA Spandex FINA Approved Dual fabric construction, which offers higher levels of compression, combined with increased freedom of movement LZR Racer Pulselite light, powerful & durable fabric LZR Racer Comprex one way stretch for higher compression Maximized support seam construction improves the linkage of the muscular kinetic chain.,Fully bonded seams