Jaco Vale Tudo MMA Fight Shorts 90% polyester Ultra-durable STR-X fabric that stretches effortlessly in all directions and wicks perspiration rapidly. This fabric was specifically developed to provide the technical needs that are essential in MMA: durability, exceptional 4-way stretch, breathability, moisture wicking and comfort. Lined construction for durability and comfort. Drawstring Tenacity waistband. 90% Polyester 10% Spandex