Nike Swim Women's Nylon Core Solid Lingerie Tank Tough Is Better! The streamlined Nike Nylon Core Solid Lingerie Tank is perfect for race day. Featuring our premium Nike NX fabric this suit offers durability and comfort during competition. Technology Nike NX More Benefits Moderate open back Thin crisscross straps for enhanced comfort Medium neck line Great fit, functionality, comfort and support Ideal for practice and race day Engineered with Nike NX, a highly durable nylon and chlorine resistant spandex blend Designed to handle the rigors of training and competition Built for superior shape retention and support