Tech suit engineered with Sonic Light Ribtex II material from the popular GX Sonic IV suit. 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. Compressive Material: Compressive panels engineered for body support and alignment throughout the race. Sewn Seams Sonic Light Ribtex II: Mizuno's most updated technical swim fabric. Grooved fabric and water resistant material offers minimal water resistance and compressive support. Water Resistant: Water repellant fabric and coating for optimal speed through the water.