53% Polyester - 47% PBT Fully lined, 100% Polyester Medium support straps Standard bottom coverage Flat seams for reduced chafing A contemporary take on team suits, the Nike Vex Racerback One Piece brings industry leading performance with style suitable for the new decade. Hydrastrong fabric provides superior chlorine resistance and long-lasting durability, meet after meet. Regular straps work for a wide range of sizes and activity with medium support. Standard bottom coverage is great for comfort and modesty.