Speedo Men's Endurance+ Polyester Solid Jammer Swimsuit 50% Polyester/50% PBT Swimsuit is Performance-Train III category. Low Moisture absorption and quick drying Speedo trademarked Endurance+ fabric that is 100% chlorine resistant to last 20 times longer with new four-way stretch technology Constructed with our exclusive 9-thread flat lock stitching technology for stronger seams and a better fit with optimal stretch Four-Way Stretch technology providing a body-hugging fit, great shape retention and soft comfort Hand wash cold water, hang or lay flat to dry.Endurance fabric creates a tighter fit than Lycra; consider sizing up