Speedo Men's Endurance+ Solid Brief Swimsuit 100% Polyester 50% polyester, 50% PBT 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 Hand wash cold water, hang or lay flat to dry Imported