The Arena Calla Challenge Back One Piece Swimsuit give you freedom of movement and endless durability with its open back design and MaxLife fabric. A chlorine-resistant material ensures long-lasting performance and undeniable performance in the water.80% Polyester, 20% Elastane.Unparalleled durability, comfort, and fit.High-quality, chlorine-resistant construction.Retains shape for more than 200 wears.