Hayabusa Mizuchi Rashguard - Long Sleeve - Black Scientifically tested and proven antimicrobial technology built into the fibers inhibits the growth of bacteria and fungi to protect against serious skin infection Advanced Thermawick technology provides thermoregulation to keep muscles warm and to diffuse sweat. Fiber fused logos guarantee uncompromised durability. Cutting edge tensile strength for perfect shape retention and optimal comfort. Engineered with supreme durability, functionality and complete breathability to maximize performance.