DOLFIN XtraSleek Eco Optik DBX BackDolfins new XtraSleek ECO team prints are now made Xtra smart with 100% recycled Nylon and XtraLife Lycra to resist Chlorine up to 10 times longer than traditional Spandex.. Our classic HP Back with thick straps provides optimum support and coverage and a sleek competition silhouette.Features:78% Recycled Nylon22% Xtra Life Lycrau00ae FiberFully-lined