Lingerie Tank, Fast Back Tank, Jammer & Brief Models Nike Core Solid - Adult Fast Back Tank Fast Back Straps. Chlorine resistant fabric. 80% Nylon / 20% Spandex. $52.95 Nike Core Solid - Youth Fast Back Tank Fast Back Straps. Chlorine resistant fabric. 80% Nylon / 20% Spandex. $52.95 Nike Core Solid - Youth Jammer 16" Side seam. Chlorine resistant fabric. 80% Nylon / 20% Spandex. $37.95 Nike Core Solid - Adult Brief 3" Side seam. Chlorine resistant fabric. 80% Nylon / 20% Spandex. $29.95 Nike Core Solid - Youth Male Brief 3" Side seam. Chlorine resistant fabric. 80% Nylon / 20% Spandex. $29.95