THE STRONGEST | The Ultimate team suit. Built with 100% polyester, DurafastÃ¢ÂÂ¢ is 100% chlorine proof for 72 hours of exposure. This durable fabric lasts 20 times longer than traditional swimwear. DurafastÃ¢ÂÂ¢ provides 100% colorfastness in addition to unsurpassed sun resistance. Our 4-Way Stretch Technology helps DurafastÃ¢ÂÂ¢ swimwear maintain its excellent fit.