The Challenge back reversible silhouette features thin straps and a contemporary cutout, full front lining, and a medium height leg cut for maximum freedom of movement and support where you need it most. arena's most advanced and longest-lasting fabric, 100% Polyester MaxLife suits are designed to deliver maximum comfort, range of motion, and chlorine resistance for the most demanding competitive swimmers, while maintaining superior softness, durability, and performance all season. Feel the difference your training deserves with arena's highest quality practice and training swimwear.