The extremely durable arena Swimsuit Solid Challenge Back is perfect for regular swimmers and competitive swimmers. The highly chlorine-resistant MaxLife fabric with integrated UV protection UPF50+ is extremely quick-drying and long-lasting. The open back in combination with thin straps and high cut leg provide maximum freedom of movement, excellent feel of water and reduced drag for the most demanding competitive swimmers, while maintaining superior softness, durability, and performance all season. Finished with a comfortable front lining. Feel the difference your training deserves with arena's highest quality practice and training swimwear.