Built for the race. Offering minimal drag through 3D Formfit technology, the GX-SONIC cap will give the swimmer that extra edge in their race. Uncured silicone for easy and clean team printing. Crush the competition with the GX-Sonic Cap. World Aquatics Approved: Approved by World Aquatics for national and international swimming competitions. World Aquatics approved racing swimsuits have a unique FINA barcode printed on the swimsuit, making it easily identifiable to swimming officials.