TYR Lifeguard Swimsuits Polyester Diamondback TYR Lifeguard Swimsuits Polyester Diamondback The Guard Durafast Diamondback Swimsuit utilizes a thin strap design, for reduced coverage and increased support. Engineered for lifeguards, the DGPL7 women's swimsuit lasts 20 times longer than traditional swimwear and is 100% chlorine proof for 72 hours of exposure. TYR Fabrication: 53% Polyester / 47% Polyester PBT