Streamlined Fastskin-inspired aesthetics. Streamlined Fastskin-inspired aesthetics. This sleek two-piece Racerback Tankini takes inspiration from the contouring seam lines and design details of our medal-winning Fastskin range, so you look and feel confident during fitness training. The racerback tankini top aids shoulder movement and offers increased back coverage, while a comfortable bust underband provides light support. Made from our quick-drying, 100% chlorine-resistant Endurance+ fabric, it offers outstanding durability, no matter how often you swim.