arena POWERSKIN CARBON CORE FX CLOSED BACK Swim at your maximum potential on game day in our Powerskin Carbon Core FX women’s racing swimsuit. Our newly developed kneeskin empowers your performance with a layered design. Outside, our Carbon Cage technology intensely compresses specific muscle groups with a locked-in feel. Parallel lines of taping along the back of the legs help hold the body high in the water. Internal taping and carbon band lining add powerful support and core stability. To enhance range of motion, the lining is separated right below the chest. Finished with a closed back.